<span>The highly reactive elements in group 7A are known for forming salts. They are called halogens, and you can find fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) in this group. Halogen means "salt-inducing."</span>
Neurons contribution MASS to the atom but not Charge to the nucleus !!
Calcium is defined as a metal because of both its physical and chemical traits. They all have an outer shell with two electrons and are very reactive. Those elements in the second column have two electrons ready to make compounds. It shouldn't surprise you that calcium has a valence of 2.
Im no sure what it is i just love helping little boys out. at this age it gives me a thrill.
Answer:
Carbonate
Explanation:
Carbonate is a combination of a carbon atom and two oxygen atoms for form a compound.