composition of atoms of the elements with atomic mass
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Consider the element helium. Its atomicnumber is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since 2+2=4, we know that the mass number of the helium atom is 4.
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Explanation:
Mass Number.
Name..................lithium
symbol.................li
atomic number......3
protons...............3
neutrons ............4
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