Isótopos

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

What defines an element in terms of its atomic structure?

• The number of electrons

• The number of protons

• The number of neutrons

• The number of atoms

Which subatomic particle's number can vary in an element?

• Atoms

• Neutrons

• Electrons

• Protons

In hydrogen atoms, which subatomic particle is always present in a fixed number?

• Atoms

• Electrons

• Protons

• Neutrons

How does the number of neutrons affect hydrogen atoms?

• It changes the number of electrons

• It alters the number of protons

• It affects the atom's mass

• It changes the element

What is a key characteristic of hydrogen atoms regarding protons?

• They always have one proton

• They have two protons

• They have no protons

• They have a variable number of protons