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Our current model of the atom can be broken down into three constituents parts – protons, neutron, and electrons. Each of these parts has an associated charge, with protons carrying a positive charge, electrons having a negative charge, and neutrons possessing no net charge.

Most atoms contain all three of these types of subatomic particles—protons, electrons, and neutrons.

The representation of atoms by using atomic numbers and mass numbers is given below: X Z A where X is the element, Z is the mass number, and A is the atomic number. For Example: c 6 12 -In this atom, the atomic number is 6 and the mass number is 12.

A chemical formula is a format used to express the structure of atoms. The formula tells which elements and how many of each element are present in a compound.

A chemical formula is a format used to express the structure of atoms. The formula tells which elements and how many of each element are present in a compound. Formulas are written using the elemental symbol of each atom and a subscript to denote the number of elements.

Atom: The smallest unit of a chemical element is called an atom. An atom is composed of three types of smaller particles, called protons, electrons, and neutrons. Different atoms have different numbers of electrons, protons, and neutrons in them. The total number of protons in an atom is defined as its atomic number.

The basic elements of an atom are proton, neutron and electron, but they are also made up of something smaller called quarks. Thus, in today's world, quarks and electrons are considered as fundamental particles which cannot be divided into smaller particles.