Answer:
And contains 22 electrons
Answer:
The answer is "
".
Explanation:
Please finds the complete question in the attached file.


The mass of acetone to be weighed is 
The alkali metals are first column, alkali earth 2nd, halogens 2nd to last, and noble gases last. Hope it helps!
That is called condensation
Answer:
Electrons
Explanation:
Cathode rays carry electronic currents through the tube. Electrons were first discovered as the constituents of cathode rays. J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.”