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Class 9 Chemistry · Chapter 2 · Test 2

Atomic and Mass Number

25 MCQs • Practice atomic number, mass number, subatomic particle calculations, isotope notation, and isotopic properties.

MCQs

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.

  1. Question 1

    What does the atomic number of an element represent?

    • ANumber of neutrons
    • BNumber of protons
    • CNumber of protons and neutrons
    • DNumber of electron shells
    Show answer

    Answer: B

    Atomic number is defined as the number of protons in the nucleus.

  2. Question 2

    What is the atomic number of an element with 11 protons?

    • A10
    • B11
    • C12
    • D23
    Show answer

    Answer: B

    The atomic number equals the number of protons so it is 11.

  3. Question 3

    How many electrons are present in a neutral atom with atomic number 17?

    • A7
    • B10
    • C17
    • D34
    Show answer

    Answer: C

    A neutral atom has equal numbers of protons and electrons.

  4. Question 4

    What is the mass number of an atom?

    • ANumber of protons only
    • BNumber of neutrons only
    • CSum of protons and neutrons
    • DSum of electrons and neutrons
    Show answer

    Answer: C

    Mass number is the total number of protons and neutrons in the nucleus.

  5. Question 5

    An atom contains 13 protons and 14 neutrons. What is its mass number?

    • A13
    • B14
    • C27
    • D28
    Show answer

    Answer: C

    Mass number = protons + neutrons = 13 + 14 = 27.

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