Atomic Structure

Question 1

What are isotopes?

Answer 1

Isotopes are atoms of the same element that have same number of protons but different number of neutrons

Question 2

State why isotopes have same chemical properties but different physical properties.

Answer 2

They have same chemical properties because they have the same atomic number.
They have different physical properties because they have different mass number.

Question 3

Define first ionisation energy

Answer 3

First ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions.
Eg. Na(g) →Na+(g) + e-
O(g) → O+(g) + e-