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Atomic Theory & Structure

Across
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.
Electrons not found in the valence orbital are said to be this type of electron.
The location of electrons in an atom.
One of more than 110-known fundamental building blocks of matter. These particles cannot be broken down by chemical means.
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.
The sum of the masses of the subatomic particles found in an atom - expressed in AMU.
A minute portion of matter; an individual unit of matter that could be anything from an atom to a planet depending upon established parameters.
When an electron absorbs energy, it "jumps" to a higher orbital and is said to be in this state.
Equivalent to the number of protons/electrons within a neutral atom of an element.
Particles that make up an atom including protons, neutrons and electrons.
The modern model of the atom defines orbitals as "the most probable location of finding an electron." Orbitals are not circular in nature, but rather regions of high probability (nodes) and regions of low probability (empty space) where an electron may be found.
The normal, expected location of an electron in a neutral atom.
The scale on which molecules, atoms and subatomic particles is found.
A positively-charged subatomic particle having a mass of 1 AMU and located in the nucleus of an atom.
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.
A negatively-charged subatomic particle located outside the nucleus of an atom, having a mass of 1/1836 AMU
Down
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
A neutral subatomic particle located in the nucleus of an atom, having a mass of 1 AMU and serving to "bind" the nucleus together.
The earliest known scientist-philosopher to have theorized the existence of micro scale particles that make up matter. He called these particles "atomos"
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.
A unit of measurement equivalent to the mass of a single proton.
the branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation.
These type of electrons are found in the outermost orbital of an atom and are responsible for the reactivity of the atom as a whole.
The basic unit of a chemical element.
This scientist conducted the Gold Foil Experiment, which proved that atoms contain a nucleus and are largely made up of empty space.
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 "center" of an atom in which scientists expect to find protons and neutrons, but not electrons.