Question

Please help Sanjam to complete the following table:

Isotopes of Hydrogen	No. of protons	No. of electrons	No. of neutrons
${}_1{}^2\mathrm{H}$		1

Answer 1

• Isotopes- Atoms of an element having the same atomic number but a different mass number are known as isotopes.
• Atomic number(Z)- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
• Mass number(A)- The number of protons and neutrons combine to give us the mass number of an atom.

Isotopes of Hydrogen-

• Hydrogen has three isotopes namely hydrogen, deuterium, and tritium.
• Hydrogen has 1 proton, Z=1, A=1.
• Deuterium has 1 proton and 1 neutron, Z=1, A=2.
• Tritium atom has 1 proton and 2 neutrons, Z=1, A=3.
• In all the three isotopes the number of electrons and protons is 1, while the mass number is changing.
• The question is about the second isotope i.e., deuterium.
• Hence, the completed table will be-

Isotopes of Hydrogen	No. of protons	No. of electrons	No. of neutrons
${}_1{}^2\mathrm{H}$	1	1	1