Hydrogen Isotopes and Their Properties

The video tutorial explains how to find the atomic number for the isotopes of hydrogen: protium, deuterium, and tritium. All these isotopes have one proton, making their atomic number one. The mass number, however, varies due to the presence of neutrons. Protium has a mass number of one, deuterium two, and tritium three. The periodic table shows an average atomic mass close to one because over 99% of hydrogen atoms are protium. The video concludes by reiterating that the atomic number for all hydrogen isotopes is one.

What is common among the isotopes of hydrogen?

• They all have the same mass number.

• They all have different atomic numbers.

• They all have one proton.

• They all have the same number of neutrons.

What is the atomic number of deuterium?

• Three

• One

• Zero

• Two

How many protons does tritium have?

• Zero

• Three

• One

• Two

What is the mass number of protium?

• Zero

• One

• Three

• Two

How is the mass number of deuterium calculated?

• By adding one proton and one neutron.

• By adding two protons.

• By adding two neutrons.

• By adding one proton and two neutrons.

What is the mass number of tritium?

• Two

• Four

• One

• Three

Why is the average atomic mass of hydrogen close to one?

• Because all isotopes have the same mass number.

• Because protium is the most common isotope.

• Because deuterium is the most common isotope.

• Because tritium is the most common isotope.

What makes the average atomic mass of hydrogen slightly more than one?

• Presence of deuterium and tritium.

• Presence of extra protons.

• Presence of helium isotopes.

• Presence of only protium.

What is the atomic number for all isotopes of hydrogen?

• Two

• Three

• One

• Zero

Which isotope of hydrogen is the least common?

• Protium

• Deuterium

• All are equally common

• Tritium