化學問題!!謝謝解答

Y is non-metal 非金屬 (F, 氟) and X is metal 金屬 (Ca, 鈣).
So Y and X can form ionic compound 離子化合物.
And the bond is ionic bond 離子鍵.

Y’s ion 離子: Y- or F-
X’s ion 離子: X2+ or Ca2+

One F- ion has -1 charge, two F- ions have -2 charges.
One Ca2+ ion has +2 charges.
Two F- ions + One Ca2+ ion = (-2) + (+2) = 0 charge.

So Z has Two F- ions and One Ca2+ ion in order to have 0 charge.

So Z is XY2 or CaF2
*when naming an ionic compound, we always name the metal’s ion first.

電子結構圖: [F-] [Ca2+] [F-]

atomic number 9 = F
atomic number 20 = Ca

so Z = CaF2 ---> ionic bond (metal + non metal)