Question # 1

The total numebr of electrons which M shell can accommodate

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2

8

18

32

--------------- are fundamental particles of an atom.

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Electron

Proton

Neutron

All of these

The elements of group 18 are called.

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Alkali metals

Noble gases

Alkaline metals

Transition metals

The central part of an atom is called.

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Electron

Proton

Neutron

Nucleus

The particle of an atom having negative charge on it.

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Electron

Proton

Neutron

Nucleus

The negetively charged particle arod nucleus are called.

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Electron

Proton

Atom

Neutron

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

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5

10

15

20

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

Atomic number of element presetnin period 2 and group 15 of the periodic table.

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4

5

6

7

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