Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:
Group Period | |||||||||
1 | 1 | 2 | 3-12 | 13 | 14 | 15 | 16 | 17 | 18 |
2 | A | B | C | ||||||
3 | D | E | F |
On the basis of the above table, answer the following questions:
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of D and E, which is bigger in size and why?
(v) Write the common name for the family to which the elements C and F belong.
The periodic table is given as:
Group Period | |||||||||
1 | 1 | 2 | 3-12 | 13 | 14 | 15 | 16 | 17 | 18 |
2 | A (Li) | B (N) | C (Ne) | ||||||
3 | D (Al) | E (Si) | F (Ar) |
Part (i): Element which forms only covalent bonds
Therefore, the element that forms only a covalent bond is element E.
Part (ii): Metal with valency 3
Thus, the metal having valency three is element D.
Part (iii): Non-metal with valency 3
Thus, the elements which is a non-metal with valency three is B.
Part (iv): Comparing sizes of B and D
Part (v): Family of elements C and F
Hence, C and F belong to the noble gases group.