The ions formed by nonmetals in group 6A and 7A...
1 answer:
Answer: Option (A) is the correct answer.
Explanation:
A non-metal is a substance which tends to gain electrons from another atom in order to acquire noble gas electronic configuration.
For example, elements of group 6A have 6 valence electrons and elements of group 7A have 7 valence electrons.
Hence, in order to know the charge acquired by the elements of these groups we should subtract their group number from 8.
So, elements of group 6A forms (8 - 6) = 2. That is ion is formed in general.
Similarly, elements of group 7A forms (8 - 7) = 1. That is ion is formed in general.
Thus, we can conclude that the ions formed by non-metals in group 6A and 7A have a numerical charge that is found by subtracting the group number from 8.
You might be interested in
We have to know the molarity of solution obtained when 5.71 g of Na₂CO₃.10 H₂O is dissolved in water and made up to 250 cm³ solution.
The molarity of solution obtained when 5.71 g of sodium carbonate-10-water (Na₂CO₃.10 H₂O) is dissolved in water and made up to 250.0 cm^3 solutionis: (A) 0.08 mol dm⁻³
The molarit y of solution means the number of moles of solute present in one litre of solution. Here solute is Na₂CO₃.10 H₂O and solvent is water. Volume of solution is 250 cm³.
Molar mass of Na₂CO₃.10 H₂O is 286 grams which means mass of one mole of Na₂CO₃.10 H₂O is 286 grams.
5.71 grams of Na₂CO₃.10 H₂O is equal to = 0.0199 moles of Na₂CO₃.10 H₂O. So, 0.0199 moles of Na₂CO₃.10 H₂O present in 250 cm³ volume of solution.
Hence, number of moles of Na₂CO₃.10 H₂O present in one litre (equal to 1000 cm³) of solution is = 0.0796 moles. So, the molarity of the solution is 0.0796 mol/dm³ ≅ 0.08 mol/dm³