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Atoms Study Terms
Term | Definition |
---|---|
An atom with a positive or negative charge | ion |
Atoms with the same number of protons, but different numbers of neutrons. | isotope |
The number that is used to identify an atom | atomic number |
Negatively charged particles that form a cloud around the nucleus of an atom | electron |
A column on the periodic table composed of atoms with similar properties | group |
Different regions around the nucleus of an atom where an electron is likely to be found | energy levels |
A number that represents the charge an atom will have with a full valence. | oxidation number |
An atom that has lost electrons so it has a positive charge. | cation |
The process of splitting the nucleus of an atom | fission |
The highest energy level in which electrons are found on a given atom | valence |
A number that represents the average amount of protons and neutrons combined for a given element. | atomic mass |
The smallest unit of a compound; formed when atoms bond | molecule |
This feature of the periodic table correlates with the number of energy levels in an atom. | periods |
Hard, usually solid elements found on the left side of the periodic table that tend to lose electrons | metals |
Elements that have characteristics of both metals and nonmetals | metalloids |
An atom with a negative charge due to gaining extra electrons | anion |
A type of radiation that is highly ionizing, but has very little penetration. | alpha |
The process of one element changing into another by releasing particles from its nucleus. | radioactive decay |
Rule stating that atoms are most stable when they have 8 electrons in their valence | octet |
Type of radiation with low ionization but high penetration | gamma |
An unstable form of an element due to its neutrons which will change into another element over time | radioisotope |
Source of energy due to combining the nucleus of two small atoms to form a larger one. | fusion |
Form of radiation produced when a proton changes into a neutron and releases an electron | beta |
A model of an atom which focuses on showing electrons on all of an atom’s energy levels | Bohr model |
Usually one or two letters that represent and certain element | chemical symbol |
A form of notation that represents a molecule | chemical formula |
A molecule which is neutral, but has a positive side and a negative side. | polar |
A force which works at close distances to bind the nucleus of an atom together | strong nuclear force |
The process of measuring the ratio of unstable isotopes to the stable form to determine the time since it formed. | radiometric dating |
A family of elements which are not reactive | noble gases |
The amount of time it takes for half of the mass of a radioactive isotope to decay into a more stable form. | half-life |