Question # 1

The particles of an element having different mass numbers.

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Proton

Neutrons

Isotopes

Atoms

Area around nucleus where electrons are found are called.

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Orbit

Shell

Both a and b

None of these

The total numebr of electrons which M shell can accommodate

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2

8

18

32

The charge present on atom is

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Positive

Negative

Both a and b

Neutral

Positively charged particle of an atom is called.

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Electron

Proton

Atom

Neutron

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

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4

5

6

7

The central part of an atom is called.

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Electron

Proton

Neutron

Nucleus

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

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1st

2nd

3rd

4th

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

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2

8

18

32

The negetively charged particle arod nucleus are called.

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Electron

Proton

Atom

Neutron

The elements of group 18 are called.

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Alkali metals

Noble gases

Alkaline metals

Transition metals

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

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5

10

15

20

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