Why matter dominates over antimatter in our universe has long been a major cosmic mystery to physicists. A new finding by the ...

When building an atom, pay close attention to the particles' electrical charges. Protons have a charge of +1. Electrons have a charge of -1. Neutrons are neutral, as its name implies. A stable ...

An atom is so small that a single drop of water contains more than a billion atoms. Although tiny, atoms are mostly empty ...

This symbol shows that chlorine has 35 particles in the nucleus (protons ... as the number of electrons and protons are equal in a neutral atom, chlorine also has 17 electrons.

After tracing many particles and examining the patterns, Rutherford deduced that the atom must have nearly all its mass, and positive charge, in a central nucleus about 10,000 times smaller than ...

Proton accelerator used by Walton & Cockroft to split the atom. Walton sits in the small observation cabin and watches the produced alpha particles on a fluorescent screen. Credit ...

Some substances, like particles of this iron, contain only one kind of atom. Iron is an element. It is made of only one type of atom: iron atoms. Sulfur is another element. It contains only sulfur ...