Question

complete the following gaps in the table

Answer 1

HEY !!! HERE IS YOUR ANSWER 》》》

To Find out proton ,electron,atomic number or mass number first you should knew all the formulas related to it-

(Z)Atomic no=no of protons or No of electrons.

(A)Mass no= no of protons + no of neutrons

no of protons = no of electrons...

HOPE IT HELPS ^_^

Answer 2

In element A
Proton is =8
Electron=8
Mass number =18

In element B
Electron=15
Neutron=16
Atomic number=15

In element C
Electron =1
Neutron =2
Atomic number=1

In element C
Proton=11
Atomic number=11
Mass number=23
Important information
(Number of electron =number of protons=Atomic number)
Mass number=Atomic number + no of neutrons