Question

Define the term atoms.
Write some key points also. ​

Answer 1

Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

A proton is positively charged. The number of protons in the nucleus ofan atom is the atomic number for the chemical element. A proton has a rest mass, denoted mp, of approximately 1.673 x 10-27 kilogram (kg). A neutron is electrically neutral and has a rest mass, denoted mn, of approximately 1.675 x 10-27 kg. The mass of a proton or neutron increases when the particle attains extreme speed, for example in a cyclotron or linear accelerator.

Answer 2

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★Atoms

$\longrightarrow$ Atoms and molecules are the building blocks of matter.

$\longrightarrow$ Atoms are divisible and they do have an inner structure Atoms have smaller particles in them in which are called subatomic particles.

$\longrightarrow$ Atoms are made up of three subatomic particles:

i) elections

ii) Protons

iii) Neutrons

$\longrightarrow$ Protons and neutrons are present in a small nucleus at the centre of the atom. electrons are outside the nucleus.

$\longrightarrow$The atoms of different elements differ in number of electrons and protons and neutrons.

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