Explanation:
Atomic number , protons and electrons have the same value / their value is same .
But for the neutron there is no specific technique. You have to remember the neutrons of every element
Answer: D:wavelenght
Explanation: Students will understand that shorter wavelengths have higher frequency and energy.
Answer: The order with respect to
is 1.
Explanation:
Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

k= rate constant
x = order with respect to 
y = order with respect to A
n = x+y = Total order
From trial 1:
(1)
From trial 2:
(2)
Dividing 2 by 1 :
therefore x= 1
Thus order with respect to
is 1.