Question

please write atom and molecules class 9 all main topics ​

Answer 1

Answer:

1. Dalton's atomic theory
2. Laws of chemical combination
3. Molecules
4. Ions
5. Atomic weight
6. Mole concept

Answer 2

Answer:

Molecules are made up of groups of atoms. Describing the structure of an atom, an atom is also sub-divided into smaller units. Protons, electrons, and neutrons are sub-particles of an atom. ... Protons are positively charged particles whereas electrons are negatively charged particles.

Explanation:

The universe is made up of atoms, which contain protons (positively charged particles), neutrons (particles with no charge), and electrons (negatively charged particles). ... Molecules are formed when two or more atoms bond together. If molecules contain atoms of different elements, that substance is known as a compound.

When two or more atoms chemically bond together, they form a molecule. Sometimes the atoms are all from the same element. ... In a covalent bond, electrons are shared between atoms. The bonds between the two hydrogen atoms and the oxygen atom in a molecule of water are covalent bonds.

Many atoms consist of a positively charged nucleus consisting of protons and neutrons surrounded by a cloud of electrons charged negatively. An atom is any particle of matter at its most basic level which contains at least one proton. Here are some examples of the atoms: hydrogen (H) neon (Ne).