URGENT PLEASE HELP NOW!! When do most ionic bonds form, based on this Periodic Table?

when elements from B bond with themselves

when elements from A bond with elements from B

when elements from C bond with elements from D

when elements from A bond with themselves

Which of these describes the rate of this chemical reaction? h2 + cl2 → 2 hcl a. an increase in the concentration of hcl and h2 with time b. an increase in the concentration of hcl with time c. an increase in h2 and cl2 with time d. a decrease in hcl and cl2 with time