Latest Atomic Structure General Knowledge(GK) Questions and answers

1 .

When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of ____

A)

unoccupied space

B)

protons

C)

neutrons

D)

deuterons (H-2)

Correct Answer : unoccupied space

2 .

An atom has a mass number of 37 and atomic number 17. How many protons does it have?

A)

17

B)

20

C)

21

D)

29

Correct Answer : 17

3 .

Which of the following is the correct electronic configuration of Nickel with an atomic number 28?

A)

1sÂ² 2sÂ² 2pâ¶ 3sÂ² 3pâ¶ 3dÂ¹â°

B)

1sÂ² 2sÂ² 2pâ´ 3sÂ² 3pâ¸ 3dÂ¹â°

C)

1sÂ² 2sÂ² 2pâ¶ 3sÂ² 3pâ¶ 3dâ¸ 4sÂ²

D)

1sÂ² 2sÂ² 2pâ´ 3sÂ² 3pâ¶ 3dÂ¹â° 4sÂ²

Correct Answer : 1sÂ² 2sÂ² 2pâ¶ 3sÂ² 3pâ¶ 3dâ¸ 4sÂ²

4 .

Who is credited with the discovery of electron?

A)

Niels Bohr

B)

Ernest Rutherford

C)

James Chadwick

D)

JJ Thomson

Correct Answer : JJ Thomson

5 .

Which of the following defines the Mass number of an atom?

A)

number of electrons

B)

number of neutrons + number of electrons

C)

number of protons + number of electrons

D)

number of protons + number of neutrons

Correct Answer : number of protons + number of neutrons

6 .

How many electrons does the outermost shell of neon have?

A)

4

B)

8

C)

12

D)

16

Correct Answer : 8

7 .

Which of the following determines the chemical properties of an element?

A)

Number of neutrons

B)

Number of protons

C)

Number of electrons

D)

All of the above

Correct Answer : Number of electrons

8 .

The number of protons in a negatively charged atom (anion) is

A)

less than the number of electrons in the atom

B)

less than the atomic number of the element

C)

more than the atomic number of the element

D)

more than the number of electrons in the atom

Correct Answer : less than the number of electrons in the atom

9 .

Atoms which have same mass number but different atomic number are called

A)

isotones

B)

isobars

C)

isotopes

D)

isomers

Correct Answer : isobars

10 .

The atomic theory of matter was first proposed by

A)

Rutherford

B)

Niels Bohr

C)

John Dalton

D)

J. J. Thomson

Correct Answer : John Dalton