The charge of proton and electron is equal in magnitude that is
. The distance between electron and proton is
or
.
Force exerted on electron by proton is calculated as follows:

Here, k is Coulomb's constant,
is charge on proton,
charge on electron and r is distance between them.
Putting the values,

Now, according to second law of Newton,

Here,
is mass of electron and a is acceleration.
Also, 
Rearranging,

Thus, the acceleration of an electron in this atom is
.
B. The periodic law
The periods that make up the periodic table were conceived by Mendeleev in 1869, not Dalton
Answer:
Combing of people or your hair is a chemical change and it is advisable to do so
3. 36 atoms total on the product side
4. Six molecules of water on the reactant side