Answer
$NaCl$
$KCl$
$CaCl_2$
$MgCl_2$
$Na_2SO_4$
$K_2SO_4$
$CaSO_4$
$MgSO_4$
Work Step by Step
$NaCl$ is formed between sodium and chlorine in a one-to-one ratio; sodium belongs to group 1 or 1A and chlorine belongs to group 7A or 17. Sodium can give up one electron, and chlorine receives one electron.
$KCl$ is formed between potassium and chlorine in a one-to-one ratio; potassium belongs to group 1 or 1A and chlorine belongs to group 7A or 17. Potassium can give up one electron, and chlorine receives one electron.
$CaCl_2$ is formed between calcium and chlorine in a one-to-two ratio; calcium belongs to group 2 or 2A and chlorine belongs to group 7A or 17. Calcium can give up two electrons, and chlorine receives one electron, so there needs to be two chlorine atoms to receive the two electrons from calcium.
$MgCl_2$ is formed between magnesium and chlorine in a one-to-two ratio; magnesium belongs to group 2 or 2A and chlorine belongs to group 7A or 17. Magnesium can give up two electrons, and chlorine receives one electron, so there needs to be two chlorine atoms to receive the two electrons from magnesium.
$Na_2SO_4$ is formed between sodium and sulfate in a two-to-one ratio; sodium belongs to group 1 or 1A, and the sulfate ion has an oxidation number of 2-. Two sodium atoms give up their two electrons, and sulfate receives two electrons.
$K_2SO_4$ is formed between potassium and sulfate in a two-to-one ratio; potassium belongs to group 1 or 1A, and the sulfate ion has an oxidation number of 2-. Two potassium atoms give up their two electrons, and sulfate receives two electrons.
$CaSO_4$ is formed between calcium and sulfate in a one-to-one ratio; calcium belongs to group 2 or 2A, and the sulfate ion has an oxidation number of 2-. Calcium can give up two electrons, and sulfate receives the two electrons, so there is only one calcium ion for every sulfate ion.
$MgSO_4$ is formed between magnesium and chlorine in a one-to-one ratio; magnesium belongs to group 2 or 2A, and the sulfate ion has an oxidation number of 2-. Magnesium can give up two electrons, and sulfate receives the two electrons, so there is only one magnesium ion for every sulfate ion.
