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 defines an element in terms of its atomic structure?

How does the number of neutrons in an atom compare to the number of protons?

What is a unique characteristic of hydrogen atoms regarding protons?

In what way can the number of neutrons vary among different atoms?

Explain the relationship between protons and neutrons in an element.