Structure Of The Atom Mock Tests

28 questions available

Structure Of The Atom Mock Test 1

Questions: 28

Sample Questions

Class 9 Science

An atom of Sodium (Na) has atomic number 11 and mass number 23. How many neutrons does it have?

A 11

B 12

C 34

D 23

Class 9 Science

An element has electron distribution in K, L, and M shells as 2, 8, 7. Its atomic number is:

A 7

B 17

C 27

D 18

Class 9 Science

Why do large atoms tend to lose electrons during chemical reactions?

A They have high electronegativity

B They have low ionization energy

C They have strong nuclear attraction

D They have complete octets

Class 9 Science

Who discovered the neutron?

A Ernest Rutherford

B James Chadwick

C J.J. Thomson

D Niels Bohr

Class 9 Science

An atom has 11 protons, 11 electrons and 12 neutrons. What is its mass number?

A 22

B 11

C 23

D 33

Class 9 Science

Which of the following is a noble gas?

A Chlorine

B Nitrogen

C Argon

D Hydrogen

Class 9 Science

The atomic mass of an element is the weighted average of the masses of its:

A Isotopes

B Isobars

C Ions

D Elements

Class 9 Science

Isotopes of an element differ in the number of:

A Protons

B Electrons

C Neutrons

D Protons and electrons

Comments

No comments yet. Be the first to share your thoughts!