This scientist created a model of the atom similar to planets orbiting a star. The nucleus was the star, and the planets were the orbitals.
The normal, expected location of an electron in a neutral atom.
When an electron absorbs energy, it "jumps" to a higher orbital and is said to be in this state.
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
A unit of measurement equivalent to the mass of a single proton.
A minute portion of matter; an individual unit of matter that could be anything from an atom to a planet depending upon established parameters.
A characteristic pattern of light emitted from a particular element when excited electrons return to the ground state, releasing energy as light in the process.
Dmitri Ivanovich Mendeleev O.S. 27 January was a Russian chemist and inventor. He formulated the Periodic Law, leading to the creation of this important document used by scientists around the world.
This scientist laid the foundation for modern atomic theory. Through his electrolysis experiment, he determined that atoms combined to form molecules, and that elements cannot be broken down by chemical means.
The "center" of an atom in which scientists expect to find protons and neutrons, but not electrons.
This scientist performed the Cathode Ray Tube experiment, which led to the conclusion that electrons are like raisins in raisin bread, and that the atom is the bread as a whole. The "Plum Pudding Model" was born.
One of more than 110-known fundamental building blocks of matter. These particles cannot be broken down by chemical means.
The sum of the masses of the subatomic particles found in an atom - expressed in AMU.
A positively-charged subatomic particle having a mass of 1 AMU and located in the nucleus of an atom.
A negatively-charged subatomic particle located outside the nucleus of an atom, having a mass of 1/1836 AMU