Valence electron/s - it's electron/s located in outer shell of an atom.
Fluorin have 7 valence electrons located in 2 shell.
2s² 2p⁵
Answer:
it is a because blood is pumped but heart so the answer is A
The answer to the question is C
Answer:
The process of photosynthesis in plants releases oxygen into the atmosphere. Respiration by plants and animals, as they use the energy stored in food, and the process of decomposition of dead organisms, releases carbon dioxide into the atmosphere. All three work together to maintain the carbon dioxide-oxygen cycle.