Based on the group valency of
elements, write the molecular formula of the following compounds
giving justification for each:
(1) Oxides of first group elements
(2) Halides of the elements of group 13, and
(3) Compounds formed when an element A of group 2 combines with an element B of group 17
Answers
Answer:(i) The valency of the group of elements is 1 and that of oxygen is 2
⇒ H O
1 2 [Cris cross]
⇒ H₂O is the formula for their oxides.
(iii) The valency of the Group 2 elements is +2 and that off Group 16 elements is -2
⇒ Mg O
2 2 [Cris cross]
⇒ MgO is the formula.
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Answer:
Explanation:
The elements in a group tend to have similar physical and chemical properties because of their similar outer shell electron structure.
1. Valency of first group elements is 1 and that of oxide ion 2. Hence, oxide of first group are X
2
O.
Eg; H O
1 2 (Criss cross)
H
2
O is the oxide.
2. Group 13 has a valency of 3 and that of halogen is 1. Hence, halide of group 13 are MX
3
Eg; B Cl
3 1 (Criss cross)
BCl
3
is the halide.
3. The valency of the Group 2 elements is +2 and that off Group 16 elements is -2. Group 2 loses electrons and group 16 accepts electrons. Hence, compounds formed are MX.
Eg; Mg O
2 2 (Criss cross)
MgO is the compound.