B S Bisht, R D Madan and, Nelson A Petrie Solutions for Chapter: Atomic Structure, Exercise 1: Questions

Elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ have atomic numbers $6, 9$ and $12$ respectively. Which of the above elements will:

(a) forms anion or negative ion.

(b) forms cation or positive ion.

(c) has $4$ electrons in the outermost orbit.

Name the element which does not contain neutrons in its nucleus.

Give two differences between sodium atom and sodium ion.

Elements $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ have atomic numbers $9,20$, and $10$ respectively.

State which one is (i) a non-metal; (ii) a metal and (iii) chemically inert.

Define: Proton, Neutron and Electron.

What is the significance of the number of protons found in the atoms of each of the different elements?

What is the relation between the number of protons and the number of electrons in an atom?

What would be the reason for an element to have atoms with different mass numbers?

Complete the above table relating to the atomic structure of the elements.