Answer the who am i? questions below with the symbol for the element i am in group 15 and period 3 i am in period 4 and group 13 i am in period 3 and group 2

First one is phosphorus

Second one is gallium

Third one is magnesium

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

answerambulatory;