When an electron moves from a higher to a lower energy level, energy is released (often as light).
Answer:
7 protons
Isotopes are atoms that have the same number of protons but different numbers of neutrons in the nucleus. You know that nitrogen-14 has 7 protons in the nucleus because it is an isotope of nitrogen, which has an atomic number equal to 7 .
Solution :
We know that :
and 
Then, 
..................(1)
Where,
= amount of solvent (in kg)
= amount of solute (in kg)
= molar mass of solute (g/mole)
= molality of solution (mole/kg)
Given :
= 
, 
= 0.250 kg, = 24.3 g
Then putting this values in the equation is (1),
g/mole
So, the molar mass of the unknown compound is 158.49 g/mole.
