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Structure of an atom for class 8

Total questions: 20

Worksheet time: 11mins

Name
Class
Date
1.

Distribution of Electrons

a)

Atomic Number

b)

Mass Number

c)

Electronic configuration

2.

Element having duplet state

a)

Neon

b)

Helium

c)

Boron

3.

Electronic configuration of Sodium

a)

2,8,1

b)

2,6

c)

2,8,7

4.

Maximum number of electrons in M shell of an atom

a)

8

b)

6

c)

18

5.

Number of protons in atom is called

a)

Mass number

b)

Atomic number

c)

Number of neutrons

6.

Isotopes have

a)

Similar chemical properties

b)

Similar physical properties

c)

Same number of neutrons

7.

Number of isotopes for Hydrogen atom

a)

1

b)

2

c)

3

8.

Isotopes have same

a)

Number of electrons

b)

Number of neutrons

c)

mass number

9.

Example of electrovalent compound is

a)

Water

b)

Ammonia

c)

Sodium Chloride

10.

Covalent compound is formed between

a)

Metals

b)

Non-metals

c)

Metal and non-metal

11.

An example of covalent molecule

a)

Chlorine

b)

Calcium oxide

c)

Sodium

12.

Electronic configuration of Oxygen

a)

2,4

b)

2,6

c)

2,8,6

13.
What are valence electrons?
a)
electrons on the first orbital always
b)
nucleus
c)
the outermost shell
d)
the number of electrons on the outermost orbital
14.

The relative mass of a proton is...

a)

Negligible

b)

1

c)

0

d)

-1

15.
Which statement best describes an electron?
a)
Smaller mass than a proton and a negative charge
b)
Smaller mass than a proton and a positive charge
c)
Greater mass than a proton and a negative charge
d)
Greater mass than a proton and a positive charge
16.
Most of the atom is filled with
a)
electrons
b)
empty space
c)
the nucleus
d)
protons
17.

What element has only one electron?

a)

Helium

b)

Carbon

c)

Lithium

d)

Hydrogen

18.

What is group 18 on the periodic tabled called?

a)

Alkali metals

b)

Noble gases

c)

Halogens

d)

Alkaline earth metals

19.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
20.

The central region of an atom where its neutrons and protons are is its

a)

nucleus

b)

core

c)

electron cloud

d)

centre

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