Question 2
On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?

Q. Which subatomic particle is not present in an ordinary hydrogen atom?

Q. Name the three subatomic particles present in an atom.

Q. On the basis of the atomic model Rutherford concluded that:

Q. (a) Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
​(b) The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?