I’m guessing you’re looking for the element with the atomic number of 20?
If that is the case, the element would be Calcium
An atom becomes an Ion (a) if it gains one or more electron(s) or (b) if it loses one or more electron(s). When it gains electrons it becomes negatively charged and is called an anion. When it loses electron(s) it becomes positively charged and is called a cation.
Asexual reproduction only requires one parent organism. The daughter cells are copies of the original cell that divided to create the daughter cells. Sexual reproduction requires two parent organisms. The two parent cells combine to form a new unique daughter cell.
B. It does not change the chemical composition of water.
Basically, ice is water before it became ice. So basically, it just returned to it's original state and form.