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CH 12 Physical Science

Across
Group 7A
Rows on the periodic table
Instrument that separates light into a spectrum
Material that allows heat to flow through it easily
Found in group 2 on the periodic table
Average mass of all the known isotopes of an element
Elements in group 8A
Elements that are shiny and good conductors of heat and electricity
Describes matter & energy at extremely small sizes
Column on the periodic table
Elements that are poor conductors of heat and electricity
Number of protons in an atom
Down
Subatomic particle that holds a negative charge
Characteristic color of light given off or absorbed by an element
Neutral subatomic particle found in the nucleus of the atom
Chart that organizes elements by their chemical properties and increasing atomic number
Material with low electrical resistance
Subatomic particle that holds a positive charge
Elements in the first group of the periodic table
Material that allows electricity to flow through it easily
Can either be positive or negative
Material that slows down or stops the flow of heat or electricity
The number of protons and neutrons in the nucleus of the atom
Atoms of the same element that have different numbers of neutrons