Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now?

Explanation:

It is known for a neutral atom number of protons equal the number of electrons. But since, it is given that there are 19 electrons so it means that the atom already has +3 charge.

Also, number of protons of an atom represent its atomic number. And when an atom loses an electron then it acquires a positive charge. When an atom gains an electron then it acquires a negative charge.

Here, because the atom loses an electron therefore, the net charge on the atom is now +4.

catya your not at all which answer i've seen you do this on another question!

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.