The compound magnesium phosphate has the chemical formula mg3(po4)2. in this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.
what does the 2 mean in the formula 5mg3(po4)2?
there are two elements in magnesium phosphate.
there are two molecules of magnesium phosphate.
there are two magnesium ions in a molecule of magnesium phosphate.
there are two phosphate ions in a molecule of magnesium phosphate.

The correct statement is there are two phosphate ions in a molecule of magnesium phosphate.

Explanation:

The given formula is . This formula has 3 elements Magnesium, phosphorous and oxygen.

The equation for the ionization of is given by the equation:

The number 2 in the given formula means that there  are two phosphate ions in a molecule of magnesium phosphate.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .