QUIZ- Can matter change its States?
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CBSE class 9
THE ATOM – Its Size (Atomic radius)
Read first – Atoms – Its Symbols Atoms – Atomic Mass What is an atom? As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron. Protons and neutrons make up the nucleus of the atom, a dense and positively …