1.
Aristotle: said that empty space cannot exist
2.
atomic number: number of protons and electrons in the nucleus
3.
atomis mass: average mass of an atom of an element
4.
atoms: building blocks of matter
5.
Democritus: discovered atoms make up all matter
6.
electrons: negativley charged particle of an atom
7.
element key: lists the symbol, atomic number, and atomic mass
8.
Ernest Rutherford: discovered protns exist in the nucleus
9.
family names: 1. Alkali Metals
2. Alkaline Earth Metals
3-12. Transition Metals
13. Boron Family
14. Carbon Family
15. Nitrogen Family
16. Oxygen Family
17. Halogens
18. Noble Gases
10.
group: rows on the periodic table
11.
hetrogeneous: can see the different parts
(ex. taco)
12.
homogeneous: cannot see the different parts
(ex. brass lamp)
13.
isotope: two or more atoms of the same elemnt but have different number of nuetrons in the nucleus
14.
James Chadwick: discovered the neutron
15.
JJ Thompson: discovered the elcetron
16.
John Dalton: came up with the atomic theory of matter
17.
Lavioser: came up with the Law of Conservation of Matter
18.
matter: anything that has mass and takes up space
19.
metalloids: have some characteristics of both metals and non-metals; solid at room tempature
20.
metals: malleable, doctile, cood conductors of heat and electricity
21.
mixture: two or more elements come together, but do not combine
(ex. salad)
22.
neutron: uncharged particle of an atom
23.
Niels Bohr: suggested electrons move in energy levels
24.
non-metals: gases or brittle solids, poor conductors of heat and electricity, basis of the chemicals of life
(people are made up of mostly non-metals)
25.
period: columns on the periodic table
26.
proton: positively charged particle of an atom
27.
quarks: protons and neutrons when cut up in to small pieces
28.
states of matter: solid
liquid
gas
29.
substance: matter that has the same compostion and properties throughout
(ex. a bar of gold)
