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Structure of the Atom Science - Structure of the Atom

CBSE - STD 9 - Science (CBSE - English Medium). 340 questions in this chapter.

Question types

Structure of the Atom question types

340 questions across 14 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

340
Questions
14
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 6M.C.Q-[Che-1M]1 Mark
Which of the following statement is correct about the atom of and element?
  1. An atom can have only protons and neutrons but no electrons.
  2. An atom can have only electrons ad neutrons but no protons.
  3. An atom can have only electron and proton but o neutron.
  4. an atom must always have a proton, neutron and electron.
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Q 10M.C.Q-[Che-1M]1 Mark
Which f the following statement is always correct?
  1. An atom has equal number of electrons and protons.
  2. An atom has equal number of electrons and neutrons.
  3. An atom has equal number of protons and neutrons.
  4. An atom has equal number of electrons, protons and neutrons.
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Q 11true 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 12true 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 13true 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 14true 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 16Fill in the blank [Che-1M]1 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 17Fill in the blank [Che-1M]1 Mark
Fill in the following blanks in respect of an atom of an element:
Number of protons
Number of neutrons
Mass number
Atomic number
Number of electrons
Valency
11
12
..............
..............
..............
..............
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Q 21Fill in the blank1 Mark
Fill in the following blanks:
Atomic number Mass number Protons Neutrons Electrons Symbol
$10$ $22$ $............$ $............$ $............$ $............$
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Q 22Fill 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 26True-False [Che-1M]1 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 27True-False [Che-1M]1 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 35Do as directed; [Che-1 M]1 Mark
Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?
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Q 39Que-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 43Que-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 49Que-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 51Answer the questions.[Che-3M]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 55Que-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 56Que-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 57Que-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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Q 58Answer the questions.[Che-5M]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 59Answer the questions.[Che-5M]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 62Answer the questions.[Che-5M]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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