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6-4
Atoms, Elements and the Periodic Table
Question | Answer |
---|---|
anything that has mass and takes up space | matter |
a small particle that makes up most types of matter | atom |
a law that states that matter is not created or destroyed - it only changes form | law of conservation of matter |
negatively charged particles in an atom | electrons |
scientist credited with discovering the electron | J.J. Thomson |
positively charged central part of the atom | nucleus |
particles in the nucleus with a positive charge | protons |
particles in the nucleus with no charge | neutrons |
matter made of only one kind of atom | element |
atoms of the same element that have different numbers of neutrons | isotopes |
the number of protons plus the number of neutrons | mass number |
the weighted average mass of the isotopes of an element | atomic mass |
kinds of elements that generally have shiny, or metallic luster | metals |
elements that are usually dull in appearance | nonmetals |
elements that have characteristics of metals and nonmetals | metalloids |
matter that has the same composition and properties throughout is called a | substance |
a substance whose smallest unit is made up of atoms of more than one element bonded together | compound |
two or more substances that together but don't combine to make a new substance | mixture |
a mixture that is the same throughout | homogeneous |
a mixture that has larger parts that are different from each other | heterogenous |