Arun Syamal Solutions for Chapter: Structure of the Atom, Exercise 1: CHECK YOUR PROGRESS

Name the scientist who coined the term electron.

Name the scientist who proved the existence of electron.

Give the name of the scientist who first prepared electrical discharge tube to show that gases conduct electricity.

An element has mass number 28 and atomic number14. Find the number of protons, neutrons and electrons in it. Write the complete symbol of the element.

What are isobars? Give an example. Do isobars exhibit similar chemical properties?

Why is it that most elements have fractional atomic mass?

Calculate the average atomic mass of chlorine using the following data:
Isotope    Natural abundance (%)    Molar mass
35 Cl                75.77                         34.9689
37 Cl                24.23                          36.9659
 

The electronic configuration of sulphur is $\left[\mathrm{Ne}\right] 3{\mathrm{s}}^2 3{\mathrm{p}}^{\mathrm{k}}$(In terms of quantum mechanical model of atom). The numerical value of k is _____.