1. How do you tell the reactivity of a metal element? 2. How do you tell the reactivity of a non-metal element?

3. How do you tell the reactivity of a gas element?

answers

Explanation:

1. In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom. More reactive metals have a greater tendency to lose electrons and form positive ions .

2.Nonmetals tend to gain electrons in chemical reactions and have a high attraction for electrons within a compound. The most reactive nonmetals reside in the upper right portion of the periodic table.

3.The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

the answer is barium and copper bromide