The question list each element and the numebr of atoms
Mg(OH)2
Mg = magnesium
What does OH with brackets aorund it mean and then the small 2
OH is an element known as Hydroxide, and the 2 indicates that there are 2 of them present.
Err, I meant to say compound not element. OH is a compound of oxygen and hydrogen. The 2 indicates there are 2 of this compounds present, which means that there are 2 of each element present.
OH is neither a compound nor an element. OH^- is the hydroxyl ion (or hydroxide ion). When paired with Mg ion it forms Mg(OH)2which is named magnesium hydroxide. The 2, when placed as a subscript after a set of parentheses, multiplies everything inside the parentheses by 2. Thus, there is 1 Mg atom, 2 O atoms, and 2 H atoms in a molecule of magnesium hydroxide.
it means that the O (oxygen) and the H (hydorgen)there are two of them.
In the chemical formula Mg(OH)2, the OH inside the brackets represents a polyatomic ion called hydroxide. A polyatomic ion is a charged group of atoms that act as a single unit. The hydroxide ion consists of one oxygen atom (O) bonded to one hydrogen atom (H). The presence of the brackets indicates that the hydroxide ion is repeating in the formula.
The small 2 written after the brackets indicates that there are two hydroxide ions present. This means that each magnesium (Mg) atom is combined with two hydroxide ions.
To determine the number of atoms of each element in the formula, we can break it down as follows:
1. Magnesium (Mg): There is one Mg atom in the formula.
2. Oxygen (O): Each hydroxide ion contains one oxygen atom, and since there are two hydroxide ions (OH)2, there are 2 x 1 = 2 oxygen atoms.
3. Hydrogen (H): Each hydroxide ion contains one hydrogen atom, and since there are two hydroxide ions (OH)2, there are 2 x 1 = 2 hydrogen atoms.
Therefore, in Mg(OH)2, there is 1 magnesium atom, 2 oxygen atoms, and 2 hydrogen atoms.