Problem

Suggest explanations for the following.(a) High values of ionization energies are associat...

Suggest explanations for the following.

(a) High values of ionization energies are associated with the noble gases.
(b) The enthalpy changes associated with the attachment of the first and second electrons to an O atom are exothermic and endothermic, respectively
(c) In an Li atom in its ground state, the outer electron occupies a 2s rather than a 2p orbital

List 1	List 2
S6 and S8	electron
19F and 31P	proton
isotope of hydrogen	pnictogens
12C and 13C	d-block elements
hydrogen ion	protium
group 1 elements	fundamental particles
same energy	ms = ±
negatively charged particle	allotropes
spin-paired electrons	degenerate
electron, proton and neutron	monotopic elements
group 15 dements	alkali metals
Cr, Mn, Fe	isotopes of an element