Protons and neutrons are in the center (nucleus) of the atom. You may want to mention that hydrogen is the only atom that usually has no neutrons. The nucleus of most hydrogen atoms is composed of ...

An atom consists of a heavy center, called the nucleus, made of particles called protons and neutrons. An atom has lighter ...

Now, most of the atoms in the universe are the two simplest kinds: hydrogen, which has one proton, zero neutrons and one electron; and helium, which has two protons, two neutrons and two electrons ...

Explain to students that by being part of a covalent bond, the electron from each hydrogen atom gets to be near two protons instead of only the one proton it started with. ... Be sure to mention ...

In most stars, hydrogen is turning into helium, and the process starts with two protons coming together to form helium-2. This usually splits back apart very quickly, but sometimes one of the ...

The number of protons defines what element it is and determines its chemical behavior. For example, carbon atoms always have six protons; hydrogen atoms always have one; and oxygen atoms always ...

Thus p, the charge number, is identical with Moseley's atomic number, Z, which determines the position of the element in the periodic table. The mass number, A, is the sum of n and p.

Protons and neutrons can collide and form nuclei like these only at very high temperatures. Scientists believe that almost all the ordinary matter in the universe is made of about 90% hydrogen ...

Now, most of the atoms in the universe are the two simplest kinds: hydrogen, which has one proton, zero neutrons and one electron; and helium, which has two protons, two neutrons and two electrons ...