Science (Ch 2) Flashcards
Matter
anything that has mass and takes up space.
Atom
the smallest particle of an element that still retains the properties of the element.
Element
substance that is made of only one type of atom.
Proton
particle inside the nucleus of an atom that has a charge of 1+.
Neutron
particle without an electrical charge.
Electron
particle with a negative charge.
Atomic Number
number of protons in an atom’s nucleus.
Mass number
the number of protons plus the number of neutrons in an atom.
Isotope
atoms of the same element that have different numbers of neutrons.
Compound
atoms of more than one type of element that are chemically bonded together.
Molecule
a group of atoms connected by covalent bonds.
Ion
electrically-charged atom whose charge results from an atom losing or gaining electrons.
Mixture
a combination of substances in which the individual substances do not change or combine chemically but instead retain their own individual properties; can be gases, solids, liquids, or any combination of them.
Heterogeneous mixture
a mixture which is not mixed evenly and each component retains its own properties.
Homogeneous mixture
solid, liquid, or gas that contains two or more substances blended evenly throughout.