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Covalent Bond

An element X ...

Question

An element X (2, 8, 2) combines separately with $N O_{3}$ and $(S O_{4})_{2}$ , $(P O_{4})_{3}$ radicals. Write the formulae of the three compounds so formed. To which group of the periodic tables does the element 'X' belong? Will it form covalent or ionic compound? Why?

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Solution

X(2,8,2) - This element is Magnesium. It belongs to group 2 of the periodic table.
$M g^{2 +} + N O_{3}^{-} \to M g (N O_{3})_{2}$ [Magnesium Nitrate]
$M g^{2 +} + (S O_{4})^{2 -} \to M g (S O_{4})$ [Magnesium Sulphate]
$M g^{2 +} + (P O_{4})^{3 -} \to M g_{3} (P O_{4})_{2}$ [Magnesium Sulphate]
Element X which is Magnesium will form ionic compounds by losing 2 electrons from its valence shell.

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Q. (a) What were the two achievements of Mendeleev's periodic table? What was the basis of classification of elements in it?
(b) An element X (2, 8, 2) combines separately with (NO₃)⁻, (SO₄)²⁻ and (PO₄)³⁻ radicals.
(c) To which group of the periodic table does the element 'X' belong? Will it form covalent or ionic compound? Why?
(d) To which period of the periodic table does the element X belong? Give reason for your answer.
(e) Write the name and symbol of element X. Also give the name and symbol of another element which belongs to the same period as element X.

The elements A, B and C belong to groups 1, 14 and 17 respectively of the periodic table.

(a) Which two elements will form a covalent compound ?

(b) Which two elements will form an ionic compound ?

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combines with oxygen to form an oxide

X_{2} O

. To which group of the periodic table does the element

X

Q. An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting.

(a) How many electrons would be there in the outermost shell of the element X?
(b) To which group of the periodic tables does the element X belong?
(c) Write the formula of the compound formed when X reacts with chlorine.

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