Answer:
The correct answer is option A. a B+ is positively charged and a B- is negatively charged.
Step-by-step explanation:
The correct option is A. The positive sign in B + indicates that element B has lost an electron. Since electrons have a negative charge, it means that the loss of said electron causes a negative charge to be lost and the element to be positively charged. The opposite case is when the element receives an electron, as in the case of B-. Upon receiving an electron, a negative charge is received, the element then being negatively charged.
B+ and B- are ions. When the charge is positive the ion is called cation and when the charge is negative the ion is called an anion.