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Structure of the Atom Science - Structure of the Atom

Gujarat Board (GSEB) - STD 9 - Science (GSEB - English Medium). 170 questions in this chapter.

Question types

Structure of the Atom question types

170 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

170
Questions
7
Question groups
5
Question types
Sample Questions

Structure of the Atom questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q. [1 M]1 Mark
The atomic number of an element $X$ is $8$ and that of element $Y$ is $4.$ Both these elements can exhibit a valency of:
  • A
    $1$
  • ✓
    $2$
  • C
    $3$
  • D
    $4$

Answer: B.

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Q 2M.C.Q. [1 M]1 Mark
The number of electrons in the atom of an element $X$ is $15$ and the number of neutrons is $16$. Which of the following is the correct representation of an atom of this element$?$
  • ✓
    $^{31}_{15}\text{X}$
  • B
    $^{31}_{16}\text{X}$
  • C
    $^{16}_{15}\text{X}$
  • D
    $^{15}_{16}\text{X}$

Answer: A.

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Q 4M.C.Q. [1 M]1 Mark
The radioactive isotope used in the treatment of cancer is:
  • A
    Plutonium$–239$
  • B
    Arsenic$–74$
  • ✓
    Cobalt$–60$
  • D
    Iodine$–131$

Answer: C.

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Q 5M.C.Q. [1 M]1 Mark
The isotopes of an element contain:
  • A
    Same number of neutrons but different number of protons.
  • B
    Same number of neutrons but different number of electrons.
  • C
    Different number of protons as well as different number of neutrons.
  • ✓
    Different number of neutrons but same number of protons.

Answer: D.

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Q 6true or false1 Mark
State whether the following statement is true or false: Radioactive isotope of iodine is used for making the medicine called tincture iodine.
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Q 7true or false1 Mark
State whether the following statements are true or false: The cathode rays obtained from all the gases consist of negatively charged particles called electrons.
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Q 8true or false1 Mark
State whether the following statements are true or false: Thomson proposed that the nucleus of an atom contains protons and neutrons.
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Q 9true or false1 Mark
State whether the following statements are true or false: The anode rays obtained from all the gases consist of positively charged particles called protons.
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Q 11Fill in the blank1 Mark
Fill in the following blanks:
Atomic number Mass number Protons Neutrons Electrons Symbol
$10$ $22$ $............$ $............$ $............$ $............$
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Q 12Fill in the blank1 Mark
Fill in the following blanks in respect of an atom of an element:
No. of Protons
No. of Neutrons
Mass number
Atomic number
No. of electrons
Symbol
$11$
$12$
$............$
$............$
$............$
$............$
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Q 20Que-Ans (Each of 2 Mark )2 Marks
The composition of two atomic particles is given below:
 
$X$
$Y$
Protons
$8$
$8$
Neutrons
$8$
$9$
Electrons
$8$
$8$
  1. What is the mass number of $X?$
  2. What is the mass number of $Y?$
  3. What is the relation between $X$ and $Y?$
  4. Which element/ elements do they represent?
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Q 24Que-Ans (Each of 2 Mark )2 Marks
Atom A has a mass number $209$ and atomic number $82$. Atom $B$ has a mass number $209$ and atomic number$ 83.$
  1. How many protons atom $A$ has?
  2. How many protons atom $B$ has?
  3. Are atoms $A$ and $B$ isotopes of the same element?
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Q 25Que-Ans (Each of 3 Mark )3 Marks
Three different atoms of oxygen are represented as:$^{16}_{\ 8}\text{O},\ ^{17}_{\ 8}\text{O}\text{ and }^{18}_{\ 8}\text{O}$
  1. What do the subscripts (lower figures) and superscripts (upper figures) represent?
  2. What factor is responsible for the change in the superscripts $16, 17$ and $18$, though the element is the same?
  3. What is the usual name for such atoms of an element?
  4. Give the nuclear composition of $​​^{18}_{\ 8}\text{O}$
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Q 29Que-Ans (Each of 5 Mark )5 Marks
The atom of an element $X$ has $7$ electrons in its $M$ shell:
  1. Write the electronic configuration of element $X.$
  2. What is the atomic number of element $X?$
  3. Is it a metal or a non-metal$?$
  4. What type of ion will be formed by an atom of element $X?$ Write the symbol of the ion formed.
  5. What could element $X$ be$?$
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Q 30Que-Ans (Each of 5 Mark )5 Marks
The electronic configuration of an element $Z$ is $2, 8, 8.$
  1. What is the atomic number of the element$?$
  2. State whether element $Z$ is a metal or a non-metal.
  3. What type of ion (if any) will be formed by an atom of element $Z?$ Why$?$
  4. What is special about the outermost electron shell or the atom of this element$?$
  5. Give the name and symbol of element $Z.$
  6. Name the group of elements to which $Z$ belongs.
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Q 31Que-Ans (Each of 5 Mark )5 Marks
An atom of element $E$ contains $3$ protons, $3$ electrons and $4$ neutrons:
  1. What is its atomic number$?$
  2. What is its mass number$?$
  3. Write the electronic configuration of the element $E.$
  4. State whether element $E$ is a metal or non-metal. Why$?$
  5. What type of ion, cation or anion, will be formed by an atom of element $E?$ Why$?$
  6. Write the symbol of the ion formed by an atom of element $E.$
  7. What could element $X$ be$?$
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