Each period in the periodic table corresponds to a principal energy level
Answer:
Its Convention Current Waves i think
Yes, anything that lives. Cells have a nucleus, they are alive and can reproduce. (Not man made/abiotic)
Answer:
Explanation:
Calcium is all around us. The average human contains approximately 1kg of calcium, of which 99% is stored in our bones. It is the 5th most abundant element in the earth's crust, occurring widely as calcium carbonate which is more commonly known as limestone. It is also the fifth most abundant dissolved ion in seawater.
