The hydrogen spectrum refers to the spectrum of light emitted or absorbed by hydrogen atoms. It is an example of the line emission spectrum or atomic emission spectrum. When an electric discharge is passed through hydrogen gas contained in a…
A spectrum is the impression or pattern formed on a screen when electromagnetic radiation of particular wavelengths is analyzed and dispersed using a prism or diffraction grating. In simple words, a series of coloured bands (wavelengths) produced when light is…
Electromagnetic spectrum is the arrangement of all the electromagnetic radiations or waves in the increasing order of their wavelengths or decreasing order of their frequencies. In simple words, the electromagnetic spectrum describes the range of many electromagnetic radiations, which differ…
In this chapter, we will understand the wave nature of electromagnetic radiation with its definition, characteristics, and examples. We know that light is an important form of energy. Isaac Newton proposed the corpuscular theory of light, which regarded the light…
The atoms of different elements containing the same number of neutrons, but different atomic number (or different number of protons and electrons) are called isotones. In simple words, isotones are atoms or nuclei of different elements that contains an identical…
When the atoms of different elements have the same mass number but different atomic number, then they are called isobars in chemistry. As the mass number is equal to the sum of the number of protons and neutrons present inside…
All the atoms of a particular chemical element have the same number of protons in their nuclei, but the number of neutrons may be different. Such atoms have the same atomic number, but mass numbers are different because of a…
In this chapter, we will understand what is mass number and how to find it with the help of solved examples. You have studied that an atom of an element consists of electrons, protons, and neutrons. The nucleus of an…
The number of protons present in the nucleus of each atom of an element is called atomic number of an element. Generally, it is represented by the symbol “Z”. The concept of the atomic number was first introduced by the…
In this chapter, we will understand the discovery of neutron discovered by James Chadwick in 1932. Up to 1932, it was considered that an atom is composed of only electrons and protons. Since electrons have negligible mass, scientists considered that…