Structure of Atom Important Definitions element 1 Atom Atoms are the smallest particles of an 2 Element Elements are the substances that can t be broken down into simpler substance 3 Subatomic particles of atom Protons Neutrons and Electrons are the subatomic particles of an atom 4 Protons Protons are the positively charged particles in the nucleus of an atom 5 Neutrons Neutrons are the uncharged particles in the nucleus of an atom 6 Electrons Electrons are the negatively charged particles which orbits the nucleus of an atom 7 Nucleus Nucleus of an atom is the positively charged central part of the atom 8 Atomic number The number of protons in the nucleus of an atom is known as the atomic number of that element 9 Atomic mass number the number of protons and the number of neutrons in the nucleus of an atom of an element is together known as the atomic mass number Ion An ion is a charged atom or molecule Anion Negatively charged atom is known Cation Positively charged atom is known 10 11 12 13 as anion as cation Isotope Atoms of same element having different number of neutrons are called the isotopes of each other
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