Question

1. The atomic number of lithium is 3. How many neutrons does an atom of lithium have fit is represented by the symbol shown below?

7
O A 2 neutrons
OB. 13 neutrons
O c. 4 neutrons
OD. 7 neutrons

Answer 1

c)4 neutrons

Step-by-step explanation:

The atomic mass of Lithium is 7.

we know,

atomic mass=no. of proton+ no. of neutron

So, no. of neutron = atomic mass - no. of proton=7-3=4

Note: Atomic number is the number of protons.

Hope, this helps you.