Answer:
a ground state electron jumps to a higher energy level
A.) half - life of a radioactive substance is defined as the time during which concentration of the substance becomes half the initial value.
Answer:
✅
Explanation:
DON'T USE DRUGS BECAUSE IT IS GOING DEATH
The Answer is D cause of the people going back and forth.
This is a chemical change because there is a new substance that was created and the new chemical can cause other chemical reaction to happen compared to the 1st state of chemical that was in the cave. Because the cave water was exposed to another environment, the calcium bicarbonate, which is also known as salt. When the cave's groundwater was exposed to a different environment the atom in the cave water rearranged and crystallized.