45 is the atomic mass of the atom. And the name is Scandium
The answer should be <span>balance electrically
</span><span>Chemical reactions that form ions should have a balanced charge. The example of the reaction is HCl. When forming ions, the equation should be:
HCl => </span>

+

In this case, the hydrogen has one plus charge and chlorine has one negative charge. The resultant should be zero, so it's balanced.
A. immigration, how is this chemistry?
Answer:
A. 1, 2, 5
Explanation:
Count the number of Ns in the formula.
- Hope that helped! Please let me know if you need a further explanation.