A balanced equation must have the same number of atoms on the both sides of equation.
Answer:
the answer is b.CH3NO2 I guess I'm correct
Answer:I think it's in the same column as a sodium on the periodic table because chemical properties are based on their electron structure and the columns called groups are elements with the same shell structure which increases in mass as you go down the column, therefore the elements which are similar to sodium must be in the same group.
Explanation:
Answer : The correct option is, 
Solution :
Formula used :
where,
E = change in energy
h = Planck’s constant = 
c = speed of light = 
= wavelength = 2.21 m
Now put all the given values in the above formula, we get the energy of an atom.
Therefore, the energy of an atom is,
