Answer:
D = A-
A = B+
B = C 2-
C= D 2+
Step-by-step explanation:
when a non-metal gains an electron, it becomes negative. Electrons have a negative charge. while protons have a positive one. when electrons are lost/gained, it determines the overall charge of the element. So when you have an element that looses an electron, it becomes +1, since protons outweigh the electrons. And when you have an element that gains an electron, it becomes -1, since the electrons outweigh the protons.