Answer to Question #95106 in General Chemistry for Shahbaz

Question

Short answer .Define atom molecules, atomic number and atomic mass)(or mass number).

Answer 1

An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.