Question

Why atom is exist?why atom is whole neutral

Answer 1

atom is whole neutral because the positive and negative charges present in the atom cancel out each other and the atom become neutral

Answer 2

Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion. If it gains one or more electrons, it now carries a net negative charge, and is thus "anionic."”