What we mean by chemical properties of a metal

chemical property of a substance is its characteristic change observed during a chemical reaction wherein the chemical identity or composition is changed.

Explanation:

some chemical properties of metal are:-

1. valency- metals show valencies between 1 and 3 because they can lose electrons between 1-3 in its outermost shell.

2. reducing agent- all the metals in the periodic table are used as reducing agents.

3. electronegativity- it is tendency to attract electrons in their molecular state and metals have low electronegativity.

4. oxide formation- metals react with oxygen to form oxides that are both basic and acidic in nature.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a