The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and one electron in the region outside the nucleus. The electron and proton are attracted to each other.

For example, a helium atom has an atomic mass of ... He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the ...

A helium atom that has lost or gained an electron is an ion. The ion has two positive protons but one electron so it is a positive ion. Helium ion, two neutrons, two protons and three electrons.

The question of what protons or neutrons are made up of has an apparently ... and how does it differ between electrons and others? The word “atom” comes from the Greek for “unable to be ...

The new Neutron rocket includes a "hippo" mouth fairing that deploys upper stages by spitting them out from inside.

The mass of an electron is very small compared to ... Calculate the number of protons, neutrons and electrons an atom of chlorine contains. Number of protons = 30 Number of protons + neutrons ...

Electrical forces bind the electron to the atom, but they cause nuclear particles to fly apart. The powerful cohesion of protons and neutrons must be explained by a wholly different phenomenon ...

What we regard as the nucleus of an atom is a beehive of ... between the nucleon's mass and size. Neutrons have been a harder ...

When two hydrogen atoms get close enough, the electron from each atom feels an attraction from the proton in the other atom's nucleus. This attraction pulls the atoms together. The electrons end up ...

For example, a helium atom has an atomic mass of ... He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the ...