Class 9 Chemistry · Chapter 2 · Test 7
Atomic Calculations
25 MCQs on protons, neutrons, electrons, atomic number, mass number, ions, and related calculations.
25 questions · 20 min · 25 marks
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Sample questions
The first 5 of 25. Try each one, then tap to see the answer.
Question 1
Which subatomic particle determines the identity of an element?
- AElectron
- BNeutron
- CProton
- DPhoton
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Answer: C
The number of protons determines the identity of an element
Question 2
What is the atomic number of an atom with 11 protons?
- A10
- B11
- C12
- D22
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Answer: B
Atomic number is equal to the number of protons
Question 3
How many neutrons are present in sodium-23 with atomic number 11?
- A11
- B12
- C23
- D34
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Answer: B
Neutrons equal mass number minus atomic number so 23 minus 11 equals 12
Question 4
An atom has 15 protons and 16 neutrons. What is its mass number?
- A15
- B16
- C31
- D1
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Answer: C
Mass number is the sum of protons and neutrons so 15 plus 16 equals 31
Question 5
How many electrons are present in a neutral atom with atomic number 19?
- A18
- B19
- C20
- D38
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Answer: B
A neutral atom has the same number of electrons and protons
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