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CPO chapter 18 terms

CPO FPS ES chapter 18 Atoms & Elements terms

QuestionAnswer
Atomic mass the average mass of all the known isotopes of an element.
Atomic mass units the mass of 1/12 of carbon-12 atoms 16 protons and 6 neutrons in the nucleus plus 6 electrons outside the nucleus.
Atomic number the number of protons that an atom contains.
Atomic theory states that all mater is composed of tiny particles called atoms.
Chemical symbol an abbreviation that represents the name of an element used; in chemical formulas.
Electrons a subatomic particle in an atom that is negatively charged and occupies energy levels in an atom; they are involved in chemical bonds and chemical; 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 ; only a certain number of electrons can be found in each energy level of an atom.
Isotopes form 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 similarities between all known elements.
Protons a subatomic particle identical with the nucleus of the hydrogen atom; found with neutrons in all atomic nuclei; carries a positive charge.
Strong nuclear forces the force that holds protons together when that are very close together only 10-15 meters apart.
Subatomic particles particles that are smaller than an atom; protons
Valence electrons the electrons in an atom that are involved in the formation of chemical bonds.
Created by: tjmelia
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