based on the valency of elements state the formula for the following giving justification for each (1)oxides of 1st group elements
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R2O is the formula for oxides of first group element
Example _
- Na2O
Example _
- Na2O
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1) Oxides of first group elements are of the form M2O since the valency of first group elements is 1(need to lose one electron only to attain octet) and of oxide ion is 2.
2M+ + O2- → M2O
2) Valency of group 13 elements is 3 and they form polar-covalent bonds. Either the size is small (as in Boron) so an ion cannot be formed or the electronegativity difference is not sufficient for ionic bonds.
M3+ + 3X- → MX3
3) Group 2 elements have a valency of 2(need to lose 2 electrons to attain octet) whereas group 16 elements also have a valency of 2 (need 2 electrons).
M2+ + O2- → MO
2M+ + O2- → M2O
2) Valency of group 13 elements is 3 and they form polar-covalent bonds. Either the size is small (as in Boron) so an ion cannot be formed or the electronegativity difference is not sufficient for ionic bonds.
M3+ + 3X- → MX3
3) Group 2 elements have a valency of 2(need to lose 2 electrons to attain octet) whereas group 16 elements also have a valency of 2 (need 2 electrons).
M2+ + O2- → MO
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