Question

Structure of atoms molecules and chemical bonds in biological science

Answer 1

All the living organism and non-living objects are formed of matter. Atoms are the building block of matter. Atoms are generally formed of three subatomic particles: electron, proton, and neutron. Each electron has one unit negative charge and each proton has one unit positive charge, whereas a neutron has no charge. Atoms aggregate and form elements so and an atom is the smallest part of an element.When the atoms are charged, then these are called ions which are of two types :

The cation is a positively charged atom e.g. Na+, K+.

The anion is a negatively charged atom e.g. Cl–.

An element is the simplest form of matter which cannot be split into two or more simpler substances by ordinary chemical methods because an element is formed of only one type of atom.

There are only 25 elements essential to life which are divided into three categories:

Principle or major elements

Minor elements

Trace or Rare elements