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Science Vocab 18

Vocabulary note cards for atoms/atomic structure

Atomic Mass The average mass of all known isotopes of an element.
Atomic mass Units defined as the mass of 1/12 of a carbon-12 atom (6 protons, neutrons in the nucleus plus 6 electrons outside the nucleus.)
Atomic Number The number of protons a atom contains.
Atomic Theory A theory that states that all matter is composed of tiny particles called atoms.
Chemical Symbol an abbreviation that represents the name of and element; used in chemicals.
Electron A subatomic particle in a atom that is negatively charged and that occupies the energy levels in an atom; electrons are involved in chemical bonds and reactions.
Energy Levels a region around the nucleus of an atom where electrons are most likely to be found; only a certain number of electrons can be found in each energy level of an atom.
Group Of Elements elements that exhibit similar chemical properties; arranged in columns on the periodic table.
Isotopes forms of the same element that have different numbers of neutrons and different mass numbers.
Mass Number the total number of protons and neutrons in the nucleus of an atom.
Neutron an uncharged particle found in the nucleus of an atom.
Nucleus the center core of an atom that contains protons and neutrons.
Periodic Table Of Elements a table that visually organizes the similarities between all known elements.
Proton a subatomic particle identical with the nucleus of the hydrogen atom; found with neutrons in all atomic nuclei; carries a positive charge.
Strong Nuclear Force the force that holds protons together when they are very close together (only 10 to the negative 15th meters apart).
Subatomic Particles particles that are smaller than an atom; protons, neutrons, and electrons are subatomic particles.
Valence Electrons the electrons in an atom that are involved in the formation of chemical bonds.
Created by: sarahmartin