Question 11 Mark
An element A has 2 electrons in its fourth shell. State:
is it anoxidisingor reducing agent
is it anoxidisingor reducing agent
Answer
View full question & answer→It is a Reducing agent.
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Question 21 Mark
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
is it a metal or non-metal
Answer
View full question & answer→It's a metal.
Question 31 Mark
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
position in the periodic table
Answer
View full question & answer→Position in the periodic table is group 2 period 4
Question 41 Mark
An element A has 2 electrons in its fourth shell. State:
itsvalency
itsvalency
Answer
View full question & answer→Its valency is 2.
Question 51 Mark
An element $A$ has $2$ electrons in its fourth shell. State:
its electronic configuration
its electronic configuration
Answer
View full question & answer→Its electronic configuration is $1s^22s^22p^63s^23p^64s^2.$
Question 61 Mark
An element A has 2 electrons in its fourth shell. State:
its atomic number
its atomic number
Answer
View full question & answer→Its atomic number is 20.
Question 71 Mark
What is the colour of the flame of sodium and potassium?
Answer
View full question & answer→The colour of the flame of sodium is golden yellow, and the colour of the flame of potassium is pale violet.
Question 81 Mark
Name the method by which alkali metals can be extracted.
Answer
View full question & answer→Alkali metals can be extracted by the electrolysis of their molten salts.
Question 91 Mark
Name the alkali metals, How many electron(s) they have in their outermost orbit.
Answer
View full question & answer→Name of the alkali metals: Lithium, sodium, potassium, rubidium, cesium, and francium
Electrons in the outermost orbit: 1
Electrons in the outermost orbit: 1
Question 101 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkali metal in period 3 dissolves in the water giving a strong alkali.
Alkali metal in period 3 dissolves in the water giving a strong alkali.
Answer
View full question & answer→Sodium (NaOH)
Question 111 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
Alkaline earth metal in period 3.
Answer
View full question & answer→Magnesium
Question 121 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Typical elements of Groups 14 and 15.
Typical elements of Groups 14 and 15.
Answer
View full question & answer→Typical elements of Period 2 belonging to Group 14 and 15 are carbon and nitrogen.
Typical elements of Period 3 belonging to Group 14 to 15 are silicon and phosphorus.
Typical elements of Period 3 belonging to Group 14 to 15 are silicon and phosphorus.
Question 131 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Bridge elements of Period 3 of Group 1,2and 3.
Bridge elements of Period 3 of Group 1,2and 3.
Answer
View full question & answer→Li and Mg; Be and Al; B and Si which form bridge relationship i.e. diagonal relationship.
Question 141 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
An electrovalent compound formed by an alkaline earth metal and a halogen.
An electrovalent compound formed by an alkaline earth metal and a halogen.
Answer
View full question & answer→Sodium chloride (NaCl)
Question 151 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.
Non-metallic elements present in Period 3 of Groups 15 and 16.
Answer
View full question & answer→Non-metallic elements present in Period 3 of Groups 15 and 16 -Phosphorus and sulphur
Question 161 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period $2$ and a halogen.
A covalent compound formed by an element in period $2$ and a halogen.
Answer
View full question & answer→Carbon tetrachloride $(CCl_4)$
Question 171 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Group whose elements have zero valencies.
Group whose elements have zero valencies.
Answer
View full question & answer→Noble gases
Question 181 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas having electronic configuration : 2, 8, 8.
Noble gas having electronic configuration : 2, 8, 8.
Answer
View full question & answer→Argon
Question 191 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Valency of elements in Group 14 and 15.
Valency of elements in Group 14 and 15.
Answer
View full question & answer→4, 3
Question 201 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Metalloid in Period 3.
Metalloid in Period 3.
Answer
View full question & answer→Silicon
Question 211 Mark
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas with duplet arrangement of electrons.
Noble gas with duplet arrangement of electrons.
Answer
View full question & answer→Element is Helium
Question 221 Mark
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element.
Answer
View full question & answer→The name of the element is Aluminium.
Question 231 Mark
An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?
Answer
View full question & answer→It's a Metal.
Question 241 Mark
An element belongs to the third period and Group IIIA (13) of the periodic table. State: thevalency,
Answer
View full question & answer→The valency is +3.
Question 251 Mark
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
Answer
View full question & answer→The number of valence electrons is 3
Question 261 Mark
What is the name given to group 17 elements? Why are they called so?
Answer
View full question & answer→Group 17 elements are called halogens. The name halogens are from Greek halo(sea salt) andgens(producing, forming) and thus means 'sea salt former'.
Question 271 Mark
Name the gas used in:
Bright colour advertising light works
Bright colour advertising light works
Answer
View full question & answer→Neon
Question 281 Mark
Name the gas used in:
Light bulbs
Light bulbs
Answer
View full question & answer→Argon
Question 291 Mark
Name the gas used in:
Filling balloons
Filling balloons
Answer
View full question & answer→Helium
Question 301 Mark
Name an element of group 18 which can form compounds.
Answer
View full question & answer→Xenon or krypton from Group 18 can form compounds.
Question 311 Mark
How many electrons do inert gases have in their valence shells?
Answer
View full question & answer→All the noble or inert gases have 8 electrons in their valence shell except helium which has two electrons in its valence shell.
Question 321 Mark
Why group 17 elements are highly reactive?
Answer
View full question & answer→Group 17 elements are highly reactive because of their closeness to the noble or stable gas configuration. They can easily achieve a noble gas electron structure.
Question 331 Mark
State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.
Answer
View full question & answer→- Group 17 elements react with metals to form metal halides which are neutral in nature.
- Group 17 elements react with non-metals to form acidic compounds such as hydrogen halides.
Question 341 Mark
Arrange the following:
Chlorine, sodium, magnesium (increasing reducing character)
Chlorine, sodium, magnesium (increasing reducing character)
Answer
View full question & answer→Cl < Mg < Na
Question 351 Mark
Arrange the following:
He, Na, Mg ( increasing order of melting point)
He, Na, Mg ( increasing order of melting point)
Answer
View full question & answer→He < Na < Mg
Question 361 Mark
Arrange the following:
Elements of group 17, in decreasing order of reactivity
Elements of group 17, in decreasing order of reactivity
Answer
View full question & answer→F > Cl > Br > I
Question 371 Mark
Arrange the following:
Elements of group 1, in increasing order of reactivity
Elements of group 1, in increasing order of reactivity
Answer
View full question & answer→$Li < Na < K < Rb < Cs$
Question 381 Mark
Give reason:
Inert gases do not form compounds.
Inert gases do not form compounds.
Answer
View full question & answer→Inert gases have 2 or 8 electrons (duplet/octet) in their outermost orbit. That is their electronic arrangement is very stable, so they are unreactive and do not form compounds.
Question 391 Mark
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Answer
View full question & answer→Alkali metals and alkaline earth metals have 1 and 2 valence electrons, respectively, in their outermost shell.
They can lose electrons to atoms of non-metals to form an electrovalent compound.
They can lose electrons to atoms of non-metals to form an electrovalent compound.
Question 401 Mark
Give reason:
Alkali metals and halogens do not occur free in nature.
Alkali metals and halogens do not occur free in nature.
Answer
View full question & answer→Alkali metals and halogens are very reactive; hence, they do not occur in the free state in nature.
Question 411 Mark
Give reason:
Alkali metals are kept in an inert solvent.
Alkali metals are kept in an inert solvent.
Answer
View full question & answer→Due to the reactive nature of alkali metals, they are kept in inert solvents.
Question 421 Mark
How do alkaline earth metals occur in nature?
Answer
View full question & answer→Alkaline earth metals occur in nature in the combined state and not in the free state as they are very reactive.
Question 431 Mark
Name the first three alkaline earth metals.
Answer
View full question & answer→The first three alkaline earth metals are Beryllium, Magnesium, and Calcium.
Question 441 Mark
This question refers to elements of the periodic table with atomic numbers from 3 to 18. In the table below, some elements are shown by letters, even though the letters are not the usual symbols of the elements.
What is the electronic configuration of G?
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Answer
View full question & answer→G has atomic number 9; therefore, its electronic arrangement is 2, 7.
Question 451 Mark
This question refers to elements of the periodic table with atomic numbers from $3$ to $18.$ In the table below, some elements are shown by letters, even though the letters are not the usual symbols of the elements.
If $A$ combines with $F$, what would be the formula of the resulting compound?
| $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
| $A$ | $B$ | $C$ | $D$ | $E$ | $F$ | $G$ | $H$ |
| $11$ | $12$ | $13$ | $14$ | $15$ | $16$ | $17$ | $18$ |
| $I$ | $J$ | $K$ | $L$ | $M$ | $N$ | $O$ | $P$ |
Answer
View full question & answer→$Li_2O$. A stands for lithium and F stands for oxygen. The valence of lithium is $+1$ and the valence of $O$ is $-2$, i.e. $A_2F.$
Question 461 Mark
This question refers to elements of the periodic table with atomic numbers from 3 to 18. In the table below, some elements are shown by letters, even though the letters are not the usual symbols of the elements.
Which of these is:
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
- a noble gas?
- a halogen?
- an alkali metal?
- an element with valency4?
Answer
View full question & answer→- H and P are noble gases.
- G and O are halogens.
- A andI are alkali metals.
- D and L have valency4.
Question 471 Mark
What is the number of elements in the $3^{rd}$ period, of the modern periodic table?
Answer
View full question & answer→There are eight elements in the third period.
Question 481 Mark
What is the number of elements in the $1^{st}$ period$?$
Answer
View full question & answer→There are two elements in the first period.
Question 491 Mark
Name two elements of each group.
Answer
View full question & answer→- Group 1: Lithium (Li), Sodium (Na)
- Group 17: Chlorine (Cl), Iodine (I)
- Group 18: Helium (He), Neon (Ne)
Question 501 Mark
What are the following group known as?
Group 18
Group 18
Answer
View full question & answer→Group 18 is known as Noble gases or Inert gases or Zero group elements.