Question # 1

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

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2

8

18

32

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

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5

10

15

20

Positively charged particle of an atom is called.

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Electron

Proton

Atom

Neutron

The numebr of electorns present in an atom s equal to number of.

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Nucleus

Neutrons

Proton

Atom

The elements of group 18 are called.

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Alkali metals

Noble gases

Alkaline metals

Transition metals

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

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1st

2nd

3rd

4th

The particles of an element having different mass numbers.

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Proton

Neutrons

Isotopes

Atoms

The negetively charged particle arod nucleus are called.

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Electron

Proton

Atom

Neutron

Formula showing maximum number of electrons in a shell.

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n2

2n2

3n2

4n2

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

The maximum numebr of electrons that N-Shell accomodate are.

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2

8

18

32

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