Answer: Cardiovascular System
Explanation:
This involves your heart, blood, veins, and arteries
The answer is number 1 - energy is emitted
Energy is released when an atom in an excited state returns to the ground state.
Answer:
A3+ and B-
Explanation:
Elements in group 13 have outermost electron configuration, ns2np1 hence they form trivalent positive ions.
Elements in group 17 have outermost electron configuration ns2np5 hence they form univalent negative ions.
This implies that, if element A is in Group 13 and element B is in Group 17, the ions formed are A3+ and B-.
