Magnesium and Hydride Ions Concepts

The video tutorial explains how to write the chemical formula for magnesium hydride. It begins by identifying magnesium and hydrogen, noting their positions on the periodic table and their typical ionic charges. The tutorial then explains that when hydrogen is bonded to a metal like magnesium, it takes on a negative ionic charge. To balance the charges and achieve a neutral compound, two hydride ions are needed for every magnesium ion, resulting in the formula MgH2. The video concludes by emphasizing the importance of recognizing the ionic charge of hydride when bonded to metals.

What is the chemical symbol for magnesium?

• Mn

• M

• Mg

• Ma

In which group of the periodic table is magnesium found?

• Group 1

• Group 2

• Group 3

• Group 4

What is the typical ionic charge of hydrogen when it forms a hydride?

• 1+

• 2+

• 2-

• 1-

Why does hydrogen have a 1- charge in magnesium hydride?

• Because it is a non-metal

• Because it is a noble gas

• Because it is bonded to a metal

• Because it is in group 1

How many hydride ions are needed to balance the charge of one magnesium ion?

• One

• Two

• Three

• Four

What is the chemical formula for magnesium hydride?

• Mg2H3

• MgH2

• MgH

• Mg2H