Which element could fill in as the X in the compound formula XH2, based on the elements & their charges by group on the periodic table?
A. Cl
B. P
C. C
D. S

i believe it is c.) 1575 j.

the objects have the same charge is correct.

nathan lee

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.