Respuesta :
Answer Choices:
A) Ca
B) O
C) Cl
D) s
A) Ca
B) O
C) Cl
D) s
the formula is Li2X, so the charge on the X anion must be 2-
the ion is X2- elements in group 6A form monatomic ions with a 2- charge. In your list that is O or Po
If the element can accomodate 12 electrons then it can have an expanded octet. Only elements in period 3 and higher can have expanded octets.
So you are looking for a group 6A element in period 3 or higher.
cA would not intereact with LI BECAUSE ITS A METAL The only element that fits the bill is D) S
Answer:
X could be S, Se, Te, Po or Lv.
Explanation:
From the formula [tex]Li_{2} X[/tex], it can be determined the charge of the ion X:
Li is a metal from the group 1 (alkaline metal) in the periodic table,so the only charge possible for it is +1. As the formula contains two Li, the total positive charge gives +2. This impplies that X must holds a charge of -2.
Inspection of the periodic table shows that atoms that commonly gain two electrons forming -2 charged anions are the ones in group 16.
The second part of the text states that X can accommodate 12 electrons expanding its octect. This effect can be observed in atoms that have empty d-orbitals available to accomodate those extra electrons. Thus, atoms from period 3 and above show octect expansion.
The elements that are in group 16 in period 3 or above are S, Se, Te, Po and Lv.
