Isotope

The video explains that an element is defined by the number of protons in its nucleus, while the number of neutrons can vary. Using hydrogen as an example, it highlights that hydrogen atoms always have one proton, but the number of neutrons can differ among atoms.

What determines the identity of an element?

• The number of neutrons

• The number of protons

• The atomic mass

• The number of electrons

What can vary among atoms of the same element?

• The number of neutrons

• The number of electrons

• The atomic number

• The number of protons

Which subatomic particle is responsible for the different isotopes of an element?

• Quarks

• Electrons

• Neutrons

• Protons

Which of the following is true about hydrogen atoms?

• They have more electrons than protons

• They have no neutrons

• They have varying numbers of neutrons

• They have varying numbers of protons

What remains constant in hydrogen atoms?

• The number of neutrons

• The number of electrons

• The atomic mass

• The number of protons