The end of a sentence always needs a period.
No!
No. You can never have two periods at the end of a sentence. "He will arrive at 6 P.M."
No it isn't. Buses will fly at 7:00PM. Is this sentence correct? [It just needed a period.
it starts at 9 pm and ends at 11 pm
"The students in 1st period today were languid from staying up past 11:00 pm"
PM or p.m. same fro AM or a.m
The time period of morning, denoted by AM or A.M., begins at 12:00 midnight AM and ends at 11:59 A.M. Noon begins PM or P.M.
PM
Argon is the atom that has the smallest radius in Period 3. As you go cross Period 3 from left to right, the atomic radii of the elements decrease. The elements in Period 3 from left to right begin with sodium and ends with argon.
PM or p.m. same fro AM or a.m
It ends at 11:05 pm
It started at 1:00 0' clock pm and ends at 9:00 pm