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atom is the smallest particle that still can be considered an element.
energy level or the specif amount of energy it has.
neutron was hard to find because it has no electric charge.
atomic mass of an of that element is the average mass of all the isotopes element.
periodic table is an arrangement of elements showing the repeating pattern of their properties.
chemical symbol a one- or two -letter representation of an element.
periods a horizontal row of elements in the periodic table.
mass number the sum of protons and neutrons in the nucleus of an atom.
isotopes atoms with the same number of protons and different numbers of neutrons .
atomic number the number of protons in the nucleus of an atom.
nucleus the central core of an atom which contains protons and neutrons.
protons small positively charged particles that are found in the nucleus of an atom.
group elements
Created by: walid j