Periodic Table
The letter for each element on the periodic table is called what?
element symbol
When molecules are very far apart and move freely, what are they called?
a gas
What are positively charged particles called?
protons
H
Hydrogen
Dalton's atomic model looked like what?
a solid sphere
The number found at the bottom of each element on the periodic table is called what? (it has to do with weight)
mass number
When molecules are tightly packed with a regular pattern and vibrate in place this is called what?
a solid
What are negatively charged particles called?
electrons
Li
Lithium
Thomson made a model that looked like plum pudding. What subatomic particle did he discover?
electrons
The organizational tool that has all of the elements is called what?
the periodic table
When molecules are loosely packed together and flow off of one another what is this called?
a liquid
How many electrons are needed in order to achieve stability?
8
Na
Sodium
Democritus had a theory that if we cut an object over and over again, we would be left with what?
an atom
The number at the top of each element is called what?
the atomic number
What is a state of matter has a definite volume and a definite shape?
a solid
What are electrons on the outermost shell called?
valence electrons
K
Potassium
Which scientist discovered the nucleus with the gold foil experiment?
Rutherford
What is the name of the family in the first column of the periodic table?
alkali metals
What is a state of matter has a definite volume, but no definite shape?
a liquid
Elements that are in the same group that share the properties are in the same what?
family
Fe
Iron
In what decade was the modern atom discovered? (it was in the 1900s)
1930s