What are you asking on this question?
Answer:
B. Na
Explanation:
To identify an atom, you simply need to look at the number of protons. This atom has 11 protons. On the periodic table, you can see that the element with 11 protons is sodium (Na).
Answer:
A. Chromosome
Explanation:
Chromosomes carry the genetic info, and the nucleus stores it.
Hope this helps :D
Answer:
the molecular formula of paradichlorobenzene is C6H4CL2
Yes, it can happen.
If all the lower energy orbits are already filled with electrons, then it cannot happen since the lower orbitals will already be full, hence another electron will have to move.
However, if the lower energy orbits are not full (for instance if one excited electron goes back to its normal state), then it can happen.
