Where in period 3 of the modern periodic table do we find:

(a) non-metals?


(b) elements forming negative ions?


(c) elements with high melting points?


(d) elements forming positive ions?


(e) metals?


(f) elements with low boiling points?


Mention their atomic numbers only.

(a) The elements with atomic number 15, 16, 17 and 18 are non-metals in 3 period because silicon with atomic number 14 is metalloid and rest of the elements are metals in 3 period.

(b) We know that non-metals form negative ions. So, the elements with atomic number 15, 16, 17 and 18 are the elements in 3 period which form negative ions.


(c) We know that metals have highest melting point due to strong metallic bond. So, the elements with atomic number 11, 12 and 13 have highest melting point in 3 period.


(d) We know that metals form positive ions. So, the elements with atomic number 11, 12 and 13 are the elements in 3 period which form positive ions.


(e) The elements with atomic number 11, 12 and 13 are the metals in 3 period.


(f) We know that non-metals have low boiling point. So, the elements with atomic number 15, 16, 17 and 18 are the elements which have low boiling point.


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