How many atoms of mg, o, and h are represented by the notation 3 formula units mg(oh)2?

3 Mg, 6 O, and 6 H

Mg(OH)2 is a compound made up of 1 atom of magnesium, 2 atoms of oxygen, 2 atoms of hydrogen.

3Mg(OH)2, means 3 formula units of Mg(OH)2; the number of atoms present will be; 3 magnesium atoms, 6 oxygen atoms and 6 hydrogen atoms.

That is; 3 × 1 Mg atom = 3 magnesium atom

3 × 2 Oxygen atoms = 6 oxygen atoms

3 × 2 Hydrogen atoms = 6 hydrogen atoms

We have that for the Question,"How many atoms of mg, o, and h are represented by the notation 3 formula units mg(oh)2?" it can be said that

The atoms of mg, o, and h are represented by the notation 3 formula units mg(oh)2 will be

From the question we are told

How many atoms of mg, o, and h are represented by the notation 3 formula units mg(oh)2?

Generally

Mg=magnesium atom

H= hydrogen atoms

O= oxygen atoms

Therefore

For 3 formula units mg(oh)2

We have

3*Mg

3*H

3*O

Also the formula  Mg(OH)2 has

1Mg

2H

2O

Hence we have that

The atoms of mg, o, and h are represented by the notation 3 formula units mg(oh)2

Will be

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first one is the correct answer