Definitions

Question 1

The atomic/proton number

Answer 1

The number of protons in the nucleus and is also known as the particular element

Question 2

Mas number

Answer 2

Number of protons and neutons in the neucleus

Question 3

Isotope

Answer 3

atoms of the smae elements with different numbers of neutrons

(same electronic structure and identical chemistry)

Question 4

Atomic mass

Answer 4

Average mass of all the isotopes present compared to 1/12th of the mass of Carben-12 atom

Question 5

First ionisation energy

Answer 5

the first ionisation energy of an element is the amount of energy needed to remove one electron from each atom in a mole of atoms of an element in the gaseous state

Question 6

Second ionisation energy

Answer 6

the energy needed to remove a second electron from each ion in a mole of ions