1
Q
The atomic/proton number
A
The number of protons in the nucleus and is also known as the particular element
2
Q
Mas number
A
Number of protons and neutons in the neucleus
3
Q
Isotope
A
atoms of the smae elements with different numbers of neutrons
(same electronic structure and identical chemistry)
4
Q
Atomic mass
A
Average mass of all the isotopes present compared to 1/12th of the mass of Carben-12 atom
5
Q
First ionisation energy
A
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
6
Q
Second ionisation energy
A
the energy needed to remove a second electron from each ion in a mole of ions
