An atom in the ground state has seven valence electrons. this atom could be an atom of which element?
a. fluorine
b. sodium
c. calcium
d. oxygen

Balance this equation: n2 + h2 > nh3, write the following molar ratios: n2 / n2 / nh3 h2 /

The number at the end of an isotope’s name is the number.

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?