Question # 1

The repetition of a property after a certain interval is:

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Periodicity

Properties

Periodicity of properties

None

............... periodic table consist of group & periods.

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Bohr

Rutherford

Mendeleev's

Nil

The atomic number of potassium is:

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11

15

18

19

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

The amount of energy given out when an electron is added to any atom is called:

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lattice energy

ionization energy

electronegative

electron affinity

The no. of periods in modern periodic table are

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7

11

18

23

________________ is the shortest period.

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6th

8th

2nd

1st

An ________________ scientist arranged the elements in order in periodic table.

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English

Italian

African

Indian

Mendeleev periodic table was based upon the:

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electronic configuration

atomic mass

atomic number

completion of a subshell

The base of modern periodic table is

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Atomic number (Z)

Mass number (A)

Avogadro's Number

Quantum Number

Along the period which one of the following decrease:

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Atomic radius

ionization energy

electron affinity

electronegative

Mark the incorrect statement about ionization energy:

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it is measured in Kjmol^-1

it is absorption of energy

it decreases in period

it decreases in a group

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9th Class Chemistry Chapter 3 Periodic Table and Periodicity of Properties English Medium KPK Boards Online Mcqs MCQs With Answers

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