Question
The number of protons, neutrons and electrons in species from A to E are given in the following table.
|
Species |
Protons |
Neutrons |
Electrons |
|
A B C D E |
6 18 17 9 17 |
6 22 20 10 18 |
4 18 17 11 17 |
Indicate from the above table the species that represent:
(i) A cation
(ii) An anion
(iii) An atom of inert gas
(iv) A pair of isotopes.
Solution
(i) A is cation, since the number of electron is less than protons.
(ii) D is anion, since the number of electron is more than protons.
(iii) B is inert gas, since the outer electron is fully.The electronic configuration is 2,8,8 filled.
(iv) C and E are isotopes to each other, since the number of protons and electrons are same but differ in neutrons.
