Question

Define atom
write it's SI unit​

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.

Explanation:

The SI unit of atomic and molecular mass is amu or u, not kilogram. One atomic mass unit is approximately equal to the 1 nucleon and numerically equivalent to 1g/mol.

The number of particles in one mole of a substance is equal to the Avogadro number.

Answer 2

Answer:

Explanation:

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. This force is is directly proportional to the charge magnitude.

It's SI unit is coulomb