1) 3mgcl2
coefficient:
subscript for mg:
subscript for ci:

In "3 MgCl₂", the coefficient is 3, the subscript for Mg is 1 and the subscript for Cl is 2.

Let's consider the expression 3 MgCl₂.

In "3 MgCl₂", the coefficient is 3, the subscript for Mg is 1 and the subscript for Cl is 2.

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Coefficient = 3

Subscript for Mg = 1

Subscript for Cl = 2

Explanation:

Coefficient:

A coefficient is number before the chemical formula which tells the number of molecules take part in chemical reaction.

For example:

2H₂ + O₂    →  2H₂O

In this reaction 2 moles of hydrogen react with one mole of oxygen and produce 2 mole of water. The number 2, 1 and 2 are the coefficient.

In given formula 3MgCl₂ the number before the formula which is three is coefficient.

While the number written as subscript tell about the number of atoms of elements. e.g.in MgCl₂ two atoms of chlorine and one atom of magnesium are present in given formula. If only one atom of particular element is present then it is not written as subscript.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

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