Vocabulary (chemistry) 8th grade
Terms in this set (23)
A pure substance that cannot be broken down into other substances by chemical or physical means.
Building blocks of matter
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
The center of an atom, which contains the protons and neutrons
One of three primary particles of an atom. It is outside the nucleus and has a negative charge.
A subatomic particle that has no charge and that is found in the nucleus of an atom
The number of protons contained in an element
the number of protons and neutrons contained in an atoms nucleus
Who created the periodic table?
Elements that are good conductors of electric current and heat.
Elements that are poor conductors of heat and electric current
Elements that have properties of both metals and nonmetals.
Vertical columns on the periodic table
A horizontal row of elements in the periodic table
An orbit followed by electrons around an atoms nucleus
Group 17 on the periodic table and very reactive
group 18 on the periodic table and are not reactive
electrons in the outermost shell of an atom that determine the atoms chemical properties
in forming compounds, atoms tend to achieve the electron configuration of a noble gas
Hydrogen and Helium only want two electrons
A one or two letter representation of an element
the number of atoms in a specific element
Indicate how many molecules take part in the reaction