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24 Cards in this Set

  • Front
  • Back
What Is Matter?
Anything that has mass and takes up space.
Name 5 things that are not matter.
Light, heat, emotion, thoughts & ideas.
What does atom mean in greek?
"Cannot be divided"
Define Atom
A small particle that makes up most types of matter.
What does The Law of Conservation of Matter state?
Matter is neither created nor destroyed.
Define Electron
A negatively charged particle.
Who discovered the electron?
J.J Thompson
Define Nucleus
The positively charged central part of the atom.
Define Proton
A positively charged particle
Who discovered the proton?
Ruherford
Define Neutron
Uncharged particles in the nucleus of an atom.
Who discovered the neutron?
James Chadwick
Define Element
A material that cannot be broken down to simpler materials by ordinary means.
What does atomic number tell you?
The number of protons in the nucleus of each atom of that element.
What does the atomic mass tell you?
How heavy its atoms are compared with atoms of other elements.
Mass Number=.....
sum of protons and neutrons
Neutrons=.......
Mass # - Protons
__________ generally have a shiny or metallic luster
Metals
_____________ are good conductors of heat and electricity.
Metals
_____________are elements that are usually dull and most are poor comductors.
Nonmetals
____________ are elements that have the characteristics of metals and nonmetals.
Metalloids
Who published the first periodic table?
Dimitri Mendeleev
Define Substance
A sample of matter that has the same composition & properties throughout.
Define Compound
A pure substance whose smallest unit is made up of atoms of more than one element.