The numbers of subatomic particles in an atom can be calculated from its atomic number and mass number. The periodic table - AQA Mendeleev made an early periodic table. In the modern periodic ...

These two types of particles are distinguished by how they ... can occupy the same orbital in an atom. "This behavior is responsible for the whole structure of the periodic table," said Hazzard.

In the case of lead-208—the heaviest stable isotope known so far—a team of researchers led by physicist Jack Henderson ...

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.

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 ...

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 ...

The word “atom” comes from the Greek for “unable ... the way down”; we would keep discovering smaller and smaller particles that made up each level we discovered. Indeed, some might ...

This photon doesn't necessarily escape the system but can be absorbed by another atom in the ground state, exciting it in turn. Such an exchange of energy—known as photon-mediated interactions—is key ...