Chapter U1, Problem 8STP

Interpretation Introduction

Interpretation:

The subscript of the metal formed by the combination of alkaline earth metal and phosphate ion, needs to be identified.

Concept introduction:

The elements are arranged in the periodic table in an increasing atomic number. All of these elements show numerous other trends and the periodic law and table can be used to explain their physical, chemical, and atomic properties.

Answer to Problem 8STP

(A). 3

Explanation of Solution

The alkaline earth metals belong to group 2 of the periodic table. They have 2 valance electrons in their outermost shell thus, they can lose 2 electrons to form ions with +2 charge.

Below is the example of the given combination:

Magnesium phosphateis an inorganic compound and considered as an alkaline earth metal phosphate. Here, magnesium contains the charge +2 and the charge on phosphate ion is -3, after cross multiplication the subscript on magnesium is 3.

Thus, the subscript on the metal is 3.

And, the correct answer is option (A) 3.