Quick question help!Watch
I’ll type it out instead:
The first ionisation energies, in kj mol, of 4 elements with consecutive atomic numbers are shown below.
a) which element could be an inert gas?
b) which element could be X in a covalent compount with formula HX?
c) which element could be Y in an ionic compound with formula YH2?
A) is Group 7
B) is group 8
C) is group 1
D) is group 2
covalent compound with HX means that 1 electron is shared and it fulfills the outer layer of both elements so it has to be group 7 to fulfill that requirement as it can't be group 1 as then it would form a ionic bond
SO Group 7 element will be before the Group 8 inert gas so it must be A since the ionisation energies are consecutive
Then now that you know that the next one is for an ionic compound
We know that 2 hydrogens so the charge is +2 (normal) or -2 (metal hydride)
So we can assume that it is gonna be the group 2 metal since it readily forms +2 metal ions
so it must be D as that will be group 2
Hope that helps Itsnotaphasemom