Matter and the periodic table Flashcards
What is matter?
A substance that has mass and occupies soace.
Define Mass
The amount of matter in a substance (objects)
Volume
That amount of space an object takes up
Physical change
A change to a sample of matter in which some properties of the material change, but the identity of the matter does not.
What is a Solid?
A state of matter that retains shape and density (degrees of compactness)
Define Liquid
A state of matter that conforms to the shape of a container in which it is held
Define gas
A state of matter that has no fixed shape and no fixed volume
Chemical change
occurs whenever matter changes into an entirely different substance with different chemical properties
Element
a pure substance made of only 1 type of atom that can not be broken down further into other substances
What is an atom?
the smallest building blocks of matter
Electron
a negative subatomic particle that is located outside the nucleus that makes up an atom
Proton
a positive subatomic particle that is located in the nucleus that makes up the atom
Neutron
a neutral (no electric charge) subatomic particle that is found in the nucleus (center of the atom) that makes up the atom
Atomic number
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
Atomic mass (weight)
togehter, the number of protons and the number of neutrons determine an elements mass number: mass number = protons + nuetrons
