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.

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 ...

The relative mass of a nucleus is the number of protons and neutrons it ... and two negative electrons. A helium atom that has lost or gained an electron is an ion. The ion has two positive ...

In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus. But they and ... and imagined it as a paired proton and electron. There was no evidence ...

Each dot represents an electron. Since the atomic number of oxygen is 8, it will have 8 protons in the nucleus. An atom of oxygen is neutral and so will have 8 electrons. Two electrons will fill ...