An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants. (a) Identify the element X (b) Write the electronic configuration of X (c) Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals? (d) What would be the nature (acidic/ basic) of oxides formed? (e) Locate the position of the element in the Modern Periodic Table

Answer:

(a) Electropositive nature of the element(s) increases down the group and decreases across the period. Lithium is the most electropositive element.

(b) Electronegativity of the element decreases down the group and increases across the period. Fluorine is the most electronegative element.

(c) Atomic size increases down the group and decreases across a period (left to right). Fluorine is the element with the smallest atomic size among the given elements

(d) Metallic character increases down the group and decreases across a period. Boron is a metalloid.

(e) Carbon is the element that shows maximum valency that is 4.

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