Atoms And Periodic Tables
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PRESENTATION OUTLINE
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.
ATOMIC MASS
- the mass of an atom of a chemical element expressed in atomic mass units.
MASS NUMBER
- the total number of protons and neutrons in a nucleus.
SUBATOMIC PARTICLE
- a particle smaller than an atom
ELECTRON CLOUD
- Electron cloud is an informal term in physics. It is used to describe where electrons are when they go around the nucleus of an atom.
ENERGY LEVEL
- the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
VALENCE ELECTRON
- a valence electron is an outer shell electron that is associated with an atom
CHEMICALLY STABLE
- Chemical stability when used in the technical sense in chemistry, means thermodynamic stability of a chemical system.
CHEMICALLY REACTIVE
- Chemical reactivity is the tendency of a substance to undergo chemical changes in a system.
CONDUCTOR
- A conductor allows electricity to flow easily
INSULATOR
- An insulator stops the flow of electricity
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.
