when metals react they (gain/lose) electrons. as you go down any group containing metals, it becomes easier to lose electrons because they are further away from the attractive force of the positive nucleus.

When metals react they lose electrons.

Explanation:

An ion is defined as a molecule or atom made up of a different number of electrons and protons. This makes the electric charge of the molecule net, not neutral.

In other words, an ion is a molecule or atom that has a positive or negative electric charge, making it an atom whose electric charge is not neutral.

The characteristic property of a metallic atom is to lose one or more of its electrons to form a positive ion. That is, metals lose electrons and acquire a net positive charge, which is why they are electropositive.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

answer: they produce more slow than unicellular organisms.