Question

1 ) What will be the valency of an atom if it contains 3 protons and 4 neutrons.

2) The atomic number and the mass number of an element are 5 and 11 respectively, calculate the

valency of it.

3) Helium atom has 2electrons in its valence shell but its valency is not 2. Explain.

4 ) The atomic number of Lithium is 3. Its mass number is 7
a) How many protons and neutrons are present in lithium atom?

b) Write the valency of lithium. c) Draw the diagram of the lithium atom.


5 ) Predict the valency of the following elements.

i. A (Atomic number 5)

ii. B (Atomic number 12)

iii. C ( Atomic number 14)

iv. D (Atomic number 17)




PLEASE ANSWER CORRECTLY OR I WILL REPORT YOUR ANSWER ITS URGENT ​

Answer 1

the attached pic is answer for 4 b) diagram of lithium atom

1. valency of atom will be 1

2. valency is 3

3. valency of helium is not 2 as its first shell is has 2 electrons, obeying the duplet rule. thus its valency will be zero

4. a) protons = atomic no = 3

neutrons = mass no - atomic no = 7-3 = 4

b) valency of lithium is 1. diagram in attached pic

5. i. 3.

ii. 2

iii. 4

iv. 1

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