Unit 2
Substances that make up a _____ may or may not retain their original properties
Mixture
1,000,000,000
Giga (G)
What word did Democritus give to the building blocks of matter?
atom
Horizontal rows on the periodic table?
periods
_____ have fixed compositions (always the same element arrangement)
Compound
1,000
Kilo (k)
What didn't prove Democritus theories?
no experimentation
Patterns repeating on the periodic table
Periodic Law
A mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension.
Colloid
10
Deka (da)
According to Aristotle, what four elements made up everything else?
fire, earth, air, and water
Mendeleev's arrangement of the periodic table
in order of increasing atomic mass
A substance that cannot be broken down into simpler substances.
Element
1/10
Deci (d)
What conclusions were made by Dalton about compounds?
compounds contain atoms of more than one element
What are three ways elements can be classified on the periodic table?
1. solid, liquid, gas
2. natural or made in a lab
3. metal, nonmetal
A homogeneous mixture where substances are dissolved.
Solution
1/1,000
Milli (m)
Who's idea did Dalton revive?
Democritus
What do fluorine, chlorine, and iodine all have in common?
-All nonmetals
-All halogens
-All 7 valence electrons