Which of the following is a correct lewis structure?
a. [: c≡c : ]
b. [: n≡n : ]
c. no right choice.

The answer to your question is letter B

Explanation:

a. [: C≡C :]   This option is not correct because Carbon only has 4 valence electrons and carbons in this structure have 5, this structure does not exist.

b. [: N≡N :]  This option is correct because because Nitrogen has 5 valence electrons and this structure shows that number of electrons.

c. No right choice. This option is incorrect because letter B is correct.

"the periodic table is arranged in order of atomic number."

i wish i could but this one is weird give me abc and i can solve it.