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There are 4 quantum numbers. Each one describes a specific electron's position relative to its nucleus.
The first one, "principal quantum number" describes the distance the talked about ele...

To start with, we can clearly see that the difference between MgO and MgS is the anions, we have O(2-) and S(2-). As we know (from looking at the periodic table) O(2-) has a smaller ionic radius, and ther...

A molecule which donates electrons

The first ionisation energy is the energy required to move one mole of electrons from one mole of atoms in its gaseous state.
The outer electron in Potassium is in the 4s orbital, which is further aw...

To tackle any question like this, you should first write out the reaction formula (I would do this on the whiteboard). You can see from this that the ratio between the reactant and product is 1:1. You can...