Question # 1

Element present in grops have same number of ....... in their outermost shell.

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Electron

Proton

Atoms

Neutron

Area around nucleus where electrons are found are called.

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Orbit

Shell

Both a and b

None of these

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

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Electron

Proton

Neutron

All of these

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

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2

8

18

32

The particles of an element having different mass numbers.

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Proton

Neutrons

Isotopes

Atoms

The central part of an atom is called.

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Electron

Proton

Neutron

Nucleus

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

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5

10

15

20

How many periods are there is the Periodic table.

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Five

Six

Seven

Eight

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

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Nucleus

Neutrons

Proton

Atom

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

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4

5

6

7

The elements of group 18 are called.

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Alkali metals

Noble gases

Alkaline metals

Transition metals

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