Question

${}_1{}^2\mathrm{H}$ is an isotope of hydrogen. Draw its structure showing clearly the number of protons, neutrons and electrons. Also, write the common name.

Answer 1

• ${}_1{}^2\mathrm{H}$ is an isotope of hydrogen with the common name of Deuterium.
• Isotopes are the atoms of the same chemical element with different mass numbers.
• The subscript denotes the atomic number which is the number of protons and is given as 1.
• In an electrically neutral atom, the number of protons and electrons is the same. Hence the number of electrons will be 1.
• The mass number is the sum of a number of protons and neutrons.
• Here superscript denotes mass number and is given as 2.
• Number of neutrons= mass number- number of protons=(2-1)10.
• Thus the number of neutrons is 1.