Which experiment led to the measurement of the charge on an electron?

What is the volume of oxygen required to burn complete 45 cm\(^3\) of methane at s.t.p?

How many electrons are in the L shell of \(^{31}_{15}\)P?

If the electron configuration of an element is 1S\(^2\) 2S\(^2\)2P\(^5\), how many unpaired electron are there?

Which of the following decrease when a given mass of gas is compressed to half its initial volume?