Modern Physics – Notes

Structure of Atoms – Structure of An Atom

An Atomic Number is the number of protons in an atom.

The arrangement of electrons in various energy levels of an atom known as electronic configuration

The maximum number of electrons in any energy level of the atom is given by 2n².

The outcome shell of an atom cannot accommodate more than eight electrons.

Combining capacity of the atoms to form molecules either with the same or different elements is known as valency.

Neutron is a neutral particle present in the nucleus.

The total number of protons and neutrons present in one atom of an element is referred as atomic mass.

Isotopes are atoms with same atomic number but different mass number.

Isotopes of certain elements are used in a nuclear reactor, and in the treatment of cancer and goitre.