Why can only Nitrogen, Phosphorus, Arsenic and Carbon form triple bonds? Check all that apply.
Because they each have 5 valance electrons
Because they each have 6 valance electrons
Because they each have 7 valance electrons
Because they each have 4 valance electrons

The conventional answer is the “expanded octet because d-orbitals” explanation.

That explanation is wrong.

Explanation:

The reason that phosphorus can form “five bonds” and nitrogen only three or four has to do with the size of the two atoms. Phosphorus can fit five fluorine atoms around itself; nitrogen cannot. For specifics, see my answer to Do atoms always obtain 8 valence electrons in a covalent bond?

You should note that nitrogen has a perfectly accessible +5 oxidation state; that’s its oxidation state in nitrate, and you can model that as having five bonds to nitrogen just as easily as y

ou can model phosphate as having five bonds to phosphorus.

For a good digest of the controversy, with citations of the relevant primary literature, see Bill Jensen’s piece “The origin of the term ‘hypervalent’” in J. Chem. Educ. 2006, 83(12), 1751–2. DOI: 10.1021/ed083p1751

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

i don,t know so just answer mine