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8TH GRADE CHEMISTRY

Across
The rows in a periodic table that classifies the elements by the number of atomic shells
Atoms of the same element that have different numbers of neutrons
A specific area where electrons of the same energy level are found
Elements that have properties of both metals and non-metals; sometimes referred to as semiconductors
The smallest unit of an element that has all of the properties of that element containing a nucleus within an electron cloud
The average mass of protons and neutrons in an element
Most elements are metals, typically solid, shiny malleable, and a good conductor of heat and electricity
model shows the atom as a tiny, positively-charged center, surrounded by electrons. These electrons travel in small circular orbits around the nucleus.
Chemical formulas and symbols written to represent a reaction
A positively charged subatomic particle in the nucleus of an atom and contributes to the mass of the atom
Down
The columns on a periodic table that arranges the elements by the number of electrons that are in the outside shell
Un-reactive non-metals in Group 18 of the Periodic Table
A shorthand notation that uses chemical symbols and numbers
The electrons in the outermost energy level of an atom that influence how an element will react with other substances
Elements typically not shiny, usually a gas or brittle solid, not malleable, and a poor conductor of heat and electricity
A subatomic particle of the nucleus of an atom that is without charge and contributes to the mass of an atom
A negatively charged subatomic particle of the electron cloud; involved in the formation of chemical bonds
A one- or two-letter notation used to represent an atom of a particular element
The number of protons in the nucleus of one atom of an element
Form as a result of the loss or gain of electrons; identified by the overall net charge
A pure substance that cannot be separated into simpler substances by physical or chemical means