Atoms And Peritic Table
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Atomic number the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Photo by TonZ
Atomic mass the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
Photo by VinothChandar
Mass number the total number of protons and neutrons in a nucleus.
Photo by Euclid vanderKroew
Subatomic particle a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle).
Photo by NASA's Marshall Space Flight Center
Electron cloud where electrons are when they go around the nucleus of an atom.
Photo by Pietro Zuco
Energy level the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.l
Photo by Jose Luis Mieza Photography
Valance electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.
Photo by paulbence
Chemically stable used in the technical sense in chemistry, means thermodynamic stability of a chemical system.
Photo by lindes
Chemically reactive is the tendency of a substance to undergo chemical changes in a system.
Photo by euthman
Conductor is a substance in which electrical charge carriers, usually electrons, move easily from atom to atom with the application of voltage.
Photo by tjmwatson
Insulator A material or an object that does not easily allow heat, electricity, light, or sound to pass through it.
Photo by ~Pawsitive~Candie_N
Semiconductor a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits.
Photo by Ervins Strauhmanis
