Question 40 of 48intermediate🔧 ApplyShort Answer3 marks

Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements. (a) Lithium and oxygen (b) Magnesium and nitrogen (c) Aluminium and iodine (d) Silicon and oxygen (e) Phosphorus and fluorine (f) Element 71 and fluorine

(a)
Answer

Li2_2O

(b)
Answer

Mg3_3N2_2

(c)
Answer

AlI3_3

(d)
Answer

SiO2_2

(e)
Answer

PF3_3 and PF5_5

(f)
Answer

LuF3_3

Explanation

The formulas of the stable binary compounds are predicted based on the valence of the elements, which is determined by their group number in the periodic table. Group 1, 2, 13, 14, 15, 16, and 17 elements typically have valences of 1, 2, 3, 4, 3/5, 2, and 1, respectively. The subscripts in the formulas are balanced by criss-crossing the valences of the combining elements.

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