Question

Match the items given in column I to those in column II in each of the following questions:

Column 1	Column 2
An atom has 1 proton, 0 neutron, and 1 electron	J. Chadwick
Discovery of neutron	Atomic number
Discovery of nucleus	${\mathrm{H}}_1^1$
Sum of protons and neutrons	Nucleons
Number of electrons and protons in an atom	Lord Rutherford

Answer 1

• J. Chadwick - James Chadwick discovered another subatomic particle that is neutral in nature known as a neutron.
• Atomic number - Atomic number is defined as the number of protons present in one atom of an element.
• ${\mathrm{H}}_1^1$ - Hydrogen is the first element of the periodic table. Its atomic number is 1, which means the number of protons it has is 1. Since the number of protons is equal to the number of electrons. Hence, the number of electrons is also 1. Also, the Hydrogen atom does not consist of any neutron.
• Nucleons - The number of protons and neutrons present in a nucleus, taken together, are known as nucleons.
• Lord Rutherford - Rutherford performs the alpha-particle scattering experiment, in which he concluded that most of the spaces in an atom are empty and it contains a small heavy mass body located at the center of an atom known as a nucleus.