Chemistry
Name the elements in the correct order of their increasing atomic numbers present in the first, second and third short periods of the periodic table.
State which of the elements are – (a) metallic (b) non-metallic (c) noble gases in each of the periods 2 and 3.
Periodic Table
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Answer
Period 1 — 1H, 2He
Period 2 — 3Li, 4Be, 5B, 6C, 7N, 8O, 9F, 10Ne
Period 3 — 11Na, 12Mg, 13Al, 14Si, 15P, 16S, 17Cl, 18Ar
The metallic, non-metallic and noble gas elements of periods 2 and 3 are listed below:
Metallic — Li, Be, Na, Mg, Al
Non-metallic — B, C, N, O, F, P, S, Cl
Noble gases — Ne, Ar
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