(a) State the number of elements in periods 1, Periods 2, and Period 3, of the periodic table. (b) name the elements in period 1.

Monjur Alahi

(a) State the number of elements in periods 1, Periods 2, and Period 3, of the periodic table.

(b) name the elements in period 1.

(c) What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?

(d) if an element is in group 17, it is likely to be ………….. (Metallic / non-metallic) in character while with one electron in its outermost energy level (shell), then it is likely to be ……………(Metallic / Non-metallic)


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Salim Ahmed Kawsar

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(a) Period 1 has 2 elements while period 2 and period 3 have 8 elements each.

(b) Hydrogen and helium

(c) The elements at the end of period 2 and Period 3 have 8 electrons in its outermost shell.

(d) if an element is in group 17, it is likely to be Non metallic (Metallic / non-metallic) in character while with one electron in its outermost energy level (shell), then it is likely to be metallic (Metallic / Non-metallic)

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