In the following table, be sure to enter a number in each box, even if that number is zero (0). T Case H₂ 0 -1 I 160+1 O 8 8 8 17-0 98 35 -2 23 Mg₁1 12 11 +2 1 Ar 18 17 9 # of protons 12 # of neutrons 0 8 8 11 # of electrons in first shell 2 2 2 2 # of electrons in second shell 0 5 7 8 # of electrons in third shell 0 0 0 4

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Q: 31

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.