ÏÐòàáë (MgF2) = 4×10-9 =
= gMg 2+× ñÐ , = gF-× 2ñÐ
ÏÐ = = (gMg 2+× ñÐ )× ( gF- × 2ñÐ)2=
=(gMg 2+ )× ( gF- )2 × 22× 1 ×(ñÐ)3