Hydrogen isotope

Okay, so you know what hydrogen is, right? It's a tiny little atom that makes up water and other stuff. Well, hydrogen also has some big brothers, called isotopes.

Now, these big brothers, they look the same as hydrogen but they have something special about them. See, just like brothers can have different names or be different ages, isotopes can have different amounts of something called neutrons.

Neutrons are like tiny balls that live inside the center of an atom, called the nucleus. So, hydrogen isotopes have different numbers of neutrons in their nucleus, which makes them a bit different from regular hydrogen.

One of the most well-known isotopes of hydrogen is called deuterium. It has one proton (like regular hydrogen) but, instead of having no neutrons, it has one or two! Because of these extra neutrons, deuterium is a bit heavier than regular hydrogen. Scientists like to study these isotopes because they behave a bit differently than regular hydrogen, and they can help us learn more about how atoms work.

So basically, hydrogen isotopes are just big brothers of regular hydrogen atoms that have different amounts of neutrons in their nucleus, making them a bit different from regular hydrogen.