In NCl3, nitrogen has five valence electrons and three of these electrons are used to form covalent bonds with the three chlorine atoms. This leaves nitrogen with two lone pairs of electrons. Lone pairs are non-bonding pairs of electrons that are not involved in chemical bonding but still contribute to the overall electron density around the nitrogen atom.
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Oh, dude, NCL3 is like a party with nitrogen and chlorine, and they're just hanging out. So, nitrogen brings 3 friends (valence electrons) to the party, but chlorine only brings 1 friend each. So, there's like 2 lone pairs chilling around nitrogen in NCL3.
The number 18.
Two pairs: 1 and 26 2 and 13
12 and 18 have three factor pairs.
Factor pairs are just the factors of a number listed in a different way. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
36, for one.