question_answer 15)

Element X forms a chloride with the formula  which is a solid with high melting point. X  would most likely to be in the same group of the periodic table as : (a) Na                                                    (b) Mg (c) Al                                                      (d) Si  

Answer:

(b) The formula of the chloride of the element is . This means that the valency of the element X is 2 since chlorine is monovalent. The element with valency 2 is expected to be present in group 2 to which magnesium (Mg) belongs.