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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 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?

  1. $^{31}_{15}\text{X}$

  2. $^{31}_{16}\text{X}$

  3. $^{16}_{15}\text{X}$

  4. $^{15}_{16}\text{X}$

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Q 2M.C.Q. [1 M]1 Mark
The ion of an element has 3 positive charges. The mass number of atom of this element is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
  1. 13
  2. 10
  3. 14
  4. 16
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Q 4M.C.Q. [1 M]1 Mark
In a sample of ethyl ethanoate (CH3COOC2H2), the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
  1. One of the oxygen atoms has gained electrons.
  2. One of the oxygen atoms has gained protons.
  3. The two oxygen atoms are isotopes.
  4. The two oxygen atoms are isobars.
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Q 15One word answer.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 19One word answer.1 Mark
The number of protons, neutrons and electrons in particles A to E are given below:
Particle
Protons
Neutrons
Electrons
A
17
18
17
B
3
4
2
C
18
22
18
D
17
20
17
E
9
10
10
Give reasons, find a pair of isotopes from the above particles.
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Q 24Que-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 26Que-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 4 Mark )4 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 30Que-Ans (Each of 4 Mark )4 Marks
An atom of an element X may be written as $^{9}_4\text{X} $
  1. What does the figure 9 indicate?
  2. What does the figure 4 indicate?
  3. What is the number of protons in atom X?
  4. What is the number of neutrons in atom X?
  5. What is the number of electrons in atom X?
  6. How many electrons are there in the outermost shell of an atom of element X?
  7. Write the symbol of ion formed by an element Z is 2, 8, 8.
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Q 31Que-Ans (Each of 4 Mark )4 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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