Dr. S P Jauhar and R Jauhar Solutions for Chapter: Structure of Atom, Exercise 2: TEST YOURSELF

Name the scientist who showed the existence of protons in an atom.

Name the isotope which is used in the treatment of cancer. 

Explain:
(i) Nucleus of an atom carries positive charge.
(ii) Most of the space in an atom is empty.
(iii) The whole mass of an atom is present in the centre of the atom. 

Mercury ($+2$) ion contains $80$ protons, $78$ electrons and $120$ neutrons. Its mass number is _____.

The element ${}_9{}^{17}\mathrm{F}$ has _____ valence electrons.

The maximum number of electrons that can be present in the outermost shell of an atom is _____.

The average atomic mass of a sample of an element '$\mathrm{X}$' is $16.2 \mathrm{u}$. What is the percentage of each isotope ${}_8{}^{16}\mathrm{X}$ and ${}_6{}^{18}\mathrm{X}$  in the sample? 

Consider the following table:

(i) How many protons are there in an atom of D?
(ii) What is the mass number of B?
(iii) Write electron distribution of C.
(iv) What is the valency of E?
(v) What is the number of electrons present in a monovalent positive cation of A and a monovalent anion of D?