Question

1. magnesium + oxygen mg o. mg^+2 :o:^-2 formula: mgo name: magnesium oxide 5) calcium + chlorine 4) calci 6)

Explanation:

For question 5: Calcium + Chlorine

Step1: Determine oxidation states

Calcium (Ca) has an oxidation state of +2 (group 2 metal, loses 2 electrons). Chlorine (Cl) has an oxidation state of -1 (group 17 non - metal, gains 1 electron).

Step2: Balance charges for formula

To balance the charges, we need 2 Cl⁻ ions to balance the +2 charge of Ca²⁺. Using the criss - cross method, the formula is $CaCl_2$.

Step3: Name the compound

The compound is an ionic compound. The name is formed by using the name of the metal (calcium) and the root of the non - metal name with the suffix - ide. So the name is calcium chloride.

Answer:

Formula: $\boldsymbol{CaCl_2}$
Name: $\boldsymbol{calcium\ chloride}$