When a potassium atom reacts with bromine, the potassium atom will
a. lose only 1 electron
b. lose 2 electrons
c. gain only 1 electron
d. gain 2 electrons?

Option (a) is the correct answer.

Explanation:

An ionic bond is generally formed by a metal and a non-metal de to transfer of electrons from metal to the non-metal.

For example, potassium is an alkali metal with atomic number 19 and its electronic distribution is 2, 8, 8, 1.

And, bromine is a non-metal with atomic number 35 and it has 7 valence electrons.

So, in order to complete their octet potassium needs to lose an electron and bromine needs to gain an electron.

Hence, both of them on chemically combining together results in the formation of an ionic compound that is, potassium bromide (KBr).

Thus, we can conclude that when a potassium atom reacts with bromine, the potassium atom will lose only 1 electron.

i think it's letter a.