Question

I. CHOOSE THE CORRECT ANSWER :

1. An atom is electrically ________

(a) Positive (b) Negative (c) Neutral (d) All of these

2. Valency of Sodium is ______

(a) One (b) Two (c) Three (d) Four

3. Nucleons comprises of _______

(a) Proton and Electron (b) neutron and electron (c) proton and neutron

(d) neutron and positron

4. The formula of Methane is ______

(a) CH2 (B) CH3 (C) CH4 (D) C2H5

II. ANSWER IN ONE WORD:

1. The _________ revolve around the nucleus.

2. Who is the discoverer of Neutron.

3. Write the mass of proton.

4. Give example for variable valency.

5. What is the valency of Aluminium.

III. ANSWER YHE FOLLOWING:

1. Differentiate mass number from Atomic number.

2. What are nucleons? Why are they called so? Write properties of nucleons​

Answer 1

I.
1.d)all of these
2.a)one
3.c)proton and neutron
4.c)CH4
II.
1.electrons

Answer 2

Answer:

1)Neutral

3)option c

4) option c

II) 1-Electrons

2- James chadwick