I'm not sure about part 1, you may need to google it, but part two is 11 protons, 11 electrons and 12 neutrons. You can find protons and electrons by just looking at the atomic number, and you can find neutrons by subtracting the atomic number from the atomic mass.
（c) the color turns deep dark and then at certain level, it turns back to light green.
(d)fastest.
Answer: The bigger the atom the lesser the ability of the atom to hold on to its valence electrons. Atomic radius can be looked at as the distance between the nucleus and the outermost energy level.
Explanation: hope this helps :)
