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atom
Question | Answer |
---|---|
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 |