Science Questions Bank.........on atomic structure

This article is about preparation of Science for Entrance exams.Students generally fobia about Maths and Science subject.They feel that they can't learn these subjects.I am just telling all of them that this is only their misconceptions.Maths and Science are very interesting subjects to learn.in this article i will present you Questions based on Atomic structure.
Atom:-


Problem :1 Name the smallest particle of matter which can't further divisible?
Ans:-Atom

problem 2:Who discover electron,proton and neutron?
Ans:-Electron discovered by:-J.J.Thomson in 1897
Proton discovered by:-Goldstein in 1886
Neutron discovered by:-Chadwick in 1932.

Problem 3: What is charge on electron,proton and neutron?
Ans:-Charge on Electron:-Negative charge which is=1.602*10^-19coulombs(-1)
Charge on Proton:-positive charge which is=1.602*10^-19coulombs(+1)
Charge on Neutron:-No charge

Problem 4: What is the order of radius of nucleus and atom?
Ans:- Radius of Atom:- 1*10^-8cm
Radius of Nucleus:- 1*10^-12cm

Problem 5: Number of proton in nucleus is called? Who discover that?
Ans:-Atomic number.It is discovered by Mosley.

Problem 6: What is Atomic mass?
Ans:-Sum of numbers of proton and neutron in nucleus.

Problem 7:Atoms of different elements whose mass number same and atomic number different is called?Give example.
Ans:-Isobar.Ex. ₁₈Ar⁴⁰,₁₉K⁴⁰

Problem 8:Atoms of different elements whose nuclei contain same number of neutron are called ?Give example.
Ans:-Isotones.Ex.₁₄Si³⁰,,₁₅P³¹


Problem 9: Atom is summarized in how many quantum numbers?
Ans:- 4
1. Principle quantum number
2.Azimuthal quantum number.
3. Magnetic quantum number.
4. Spin quantum number
Problem 10: What is Aufbau principle?
Ans:- Electron enters an orbital of lowest energy.