Yes most abbreviations end with a period.
The word "speaker" can be abbreviated as "spkr."
The abbreviation for the word noun, most dictionaries use: n.
The word "migration" can be abbreviated as "mig."
The word state can be abbreviated as "St."
The word "would not" can be abbreviated as "wouldn't."
Bachelor of Science is abbreviated B.S.
You can abbreviate it as Elem. (using a period to show it is abbreviated)
The word "speaker" can be abbreviated as "spkr."
Yes, the noun 'temporary' is a word for an employee hired for a limited period of time (often abbreviated as a 'temp'); a word for a person.
The word "hertz" can be correctly abbreviated as "Hz."
It's already abbreviated. But if you mean "What is doesn't abbreviated for?" it means does not.
Do you put a period after a stated when it is abbreviated in an address?
ORG is how organization is abbreviated.
It is abbreviated to the "web".
No.
The word managed can be abbreviated in a couple different ways. These include "man" and "mgd". However, the word managed is not usually abbreviated.
Manager is abbreviated Mgr.