Na, Rb, S, Cl rank the atoms from largest to smallest electronegativity. to rank items as equivalent overlap them.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying

answer carbon and three oxygen atoms;