Electron transfer is the term for this process. The resulting anion and cation are attracted by Coulombic forces and an ionic compound is formed. Ionic compounds are neutral: the number of electrons lost in forming the cation(s) must equal the number gained in forming the anion(s). For example, Aluminum (Al, Z = 13, Group 3A or 13) will lose 3 electrons to become Al3+ which is isoelectronic with Neon (Ne), its closest noble gas. To form an ionic compound those 3 electrons must be picked up by a nonmetal. Two possibilities are:
Nitrogen (N, Z = 7, Group 5A or 15) gains all 3 electrons to become isoelectronic with Neon (Z = 10). The compound formed is AlN
3 Chlorine atoms (Cl, Z = 17, Group 7A or 17) each gain 1 electron to become isoelectronic with Argon (Ar, Z = 18). The symbol for the compound formed is AlCl3. The subscript after Cl indicates that 3 Cl- anions are required.
(1 pt) Form an ionic compound with sodium (Na):
Its atomic number is:
How many electrons must it lose to have the same number of electrons as its nearest noble gas?
Write the symbol for the ion:
Which nonmetal atom needs to gain that same number of electrons to have the same number of electrons as its nearest noble gas?
Write the symbol for the compound formed:
(1 pt) Form an ionic compound with calcium (Ca):
Its atomic number is:
How many electrons must it lose to have the same number of electrons as its nearest noble gas?
Write the symbol for the ion:
Which nonmetal atom needs to gain that same number of electrons to have the same number of electrons as its nearest noble gas?
Write the symbol for the compound formed:
Answers: 3
which is isoelectronic to Neon (Ne ,Z = 10).The symbol for the sodium ion is 
.Chlorine atom (
, Z = 17, Group 7A or 17) gains 1 elecron to be  isoelectronic to neon.The symbol for the compound formed is NaCl.PART 2:Atomic number of calcium is 20Calcium(Ca, Z = 20 ,Group 2A) will lose two electrons to become 
which is isoelectronic to argon. The symbol for the ion is 
Two chlorine atoms (Cl, Z = 17, Group 7A or 17) each gains one electron to be isoelectronic to argon(Z = 18)The symbol for the compound formed is 
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