Question # 1

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

The central part of an atom is called.

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Electron

Proton

Neutron

Nucleus

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

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Nucleus

Neutrons

Proton

Atom

How many periods are there is the Periodic table.

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Five

Six

Seven

Eight

The negetively charged particle arod nucleus are called.

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Electron

Proton

Atom

Neutron

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

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2

8

18

32

The mass of an atom is almost due to the.

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Electron

Proton

Nucleus

Neutrons

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

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4

5

6

7

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

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Group

Period

Orbit

Shell

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

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1st

2nd

3rd

4th

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