Question # 1

The central part of an atom is called.

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Electron

Proton

Neutron

Nucleus

The charge present on atom is

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Positive

Negative

Both a and b

Neutral

The particles of an element having different mass numbers.

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Proton

Neutrons

Isotopes

Atoms

There are ............ groups in periodic table.

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2

8

18

32

The particle of an atom having negative charge on it.

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Electron

Proton

Neutron

Nucleus

Area around nucleus where electrons are found are called.

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Orbit

Shell

Both a and b

None of these

Formula showing maximum number of electrons in a shell.

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n2

2n2

3n2

4n2

In .... elements are arranged in order of increasing atomic numbers.

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Group

Period

Orbit

Shell

An element with fifteen protons in its atomic nucleus has atomic numebr.

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5

10

15

20

The total numebr of electrons which M shell can accommodate

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2

8

18

32

Letter K is used to express theshell around the nucleus of an atom.

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1st

2nd

3rd

4th

How many periods are there is the Periodic table.

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Five

Six

Seven

Eight

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