| Order of period | $1, 2, 3, 4, 5, 6, 7$ |
| Last element | $He, Ne, Ar, Kr, Xe, Rn, Og$ |
| $Z$ of last element | $2, 10, 18, 36, 54, 86, 118$ |
| $Z$ | $118, 117, 116, 115, 114$ |
| Group | $18, 17, 16, 15, 14$ |
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