Which of the following is true in regard to ions?

Here are some of the facts about ions:
An ion is a charged molecule or atom. It is positively when there are more protons than electrons. You call it positive ion.  
It is negatively charged when there are more electrons than protons. It is called anion. 

Two ions that produced similar colors in the flame test were Ca+2 and Sr+2. 3.

Explanation:

The colors are produced when an electron jumps to a higher level and then jump back down.