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Class 9 Chemistry · Chapter 8 · Test 4

Atomic Radius Trends

25 MCQs covering the definition and unit of atomic radius, calculation of atomic radius, atomic size across periods and down groups, nuclear charge, electron shells, shielding effect, and the periodic trends of atomic radius.

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 is atomic radius?

    • AThe distance between an atom and its ion
    • BHalf the distance between the nuclei of two identical bonded atoms
    • CThe distance between two protons
    • DThe distance between two electrons
    Show answer

    Answer: B

    Atomic radius is half the distance between the nuclei of two identical bonded atoms.

  2. Question 2

    What unit is commonly used to express atomic radius?

    • AMeter
    • BCentimeter
    • CPicometer
    • DKilometer
    Show answer

    Answer: C

    Atomic radius is commonly expressed in picometers.

  3. Question 3

    What is the value of one picometer?

    • A10^-6 m
    • B10^-9 m
    • C10^-12 m
    • D10^-15 m
    Show answer

    Answer: C

    One picometer is equal to 10^-12 meter.

  4. Question 4

    If the distance between the nuclei of two identical bonded carbon atoms is 154 pm what is the atomic radius of carbon?

    • A77 pm
    • B154 pm
    • C308 pm
    • D52 pm
    Show answer

    Answer: A

    Atomic radius is half the internuclear distance so 154 pm divided by 2 gives 77 pm.

  5. Question 5

    How does atomic radius generally change from left to right across a period?

    • AIt increases
    • BIt decreases
    • CIt remains constant
    • DIt becomes zero
    Show answer

    Answer: B

    Atomic radius generally decreases from left to right across a period.

More tests in Periodic Table and Periodicity

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