1
Q
definition of atomic radius
A
half the shortest inter-nuclear distance found in the structure of the element
2
Q
definition of first ionisation energy
A
energy required to remove one mole of electrons from one mole of gaseous atoms to form 1 mole of gaseous ions
3
Q
why are ionisation energy endothermic
A
energy is absorbed during ionisation to overcome the attraction between the electron and the nucleus
4
Q
definition of electronegativity
A
relative measure of its ability to attract bonding electrons
