Please help as clearly as possible, i have no idea on how to find these answers

Question

Please help as clearly as possible, i have no idea on how to find these answers

Give the name(s) of the element(s) fitting each of the following descriptions: The third row element with the largest first ionization energy. The Group 3A element with the largest first ionization energy. The Group 3A element with the largest atomic radius. The element from the first 10 elements that would be most similar in properties to the element of atomic number 115 (presently unknown). The third row element having 4 valence electrons. The element in the second period having the most negative electron affinity. The element whose +2 cation has the same electronic configuration as krypton. The lightest element having a half-filled p subshell in the valence shell. The element whose -2 anion has the same electronic configuration as argon.

Explanation / Answer

a) Argon , ( noble gases will have high IP and Argon is 3rd row element)

b) 3A group is brorn group and Boron has highest first IE

c) Thalium ( in group from top to bottom atomi cradius increases , hence Tl has largest radius)

d) Nitrogen ( since both N and element with atomic number 115 belong to same group)

e) Silicon ( only carbon group has 4 valence electrons and Si is third row in periodic table)

f) Neon ( element will have negative electron affinity when energy released is less i.e electron is added to atom such that atom destabilises , Neon is stable with octect configuration , hence electromn addition destabilises)

g) Strontium ( Sr2+ has same electrons as Krypton )

h) Nitrogen ( Nitrogen has 1s2 2s2 2p3 , and in its group Nitrogen exists as gas )

i) Sulphur ( S2- has same electrons as argon)

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