Atom's History
Atom's Structure
Groups
Periodic Table
Grab Bag
100
Who first named the atom?
Democritus
100
Subatomic particle with a positive charge.
Proton
100
The most reactive metals
Alkali metals
100
The period number tells you
Number of energy levels.
100
The number of protons and neutrons is represented by
Mass number
200
Who developed the atomic model that says electrons travel in fixed orbits around the nucleus?
Bohr
200
Charge of a neutron
Neutral/ no charge
200
The most reactive nonmetals
Halogens
200
Semi-conductors on the periodic table are classified as
Metalloids
200
Isotopes are atoms of the same element with different numbers of
Neutrons
300
This person's model had electrons scattered through out a positive mass - AKA Plum Pudding
Thomson
300
Where is most of the mass of an atom found?
the nucleus
300
All elements in this group have 2 valence electrons
Alkaline Earth metals
300
Which number can be used to determine the identity of the element?
Atomic number
300
What noble gas does not have 8 valence electrons?
Helium
400
This person said that all atoms of the same element are the same and atoms of different elements are different.
Dalton
400
How many electrons cab be held in the first energy level?
2
400
This group of elements will never combine with any other elements in nature.
Nobel gases
400
Hydrogen's most common isotope has _________ protons and _____________ neutrons
1 proton
0 neutrons
400
Draw the bohr model for the most common isotope of Sulfur
500
Draw the current model of the atom and list 2 scientists who helped develop this.
Schrodinger, Heisenberg, Einstein 
500
If an atom has 4 energy levels that are full of electrons, how many total electrons would it have?
36
500
This element is the only one in its group that belongs with the group # (due to valence electrons) but not with the same group name.
Hydrogen
500
This element is the only metalloid with 2 energy levels
Boron
500
Write the two types of isotope notation for the most common form of sodium in nature
Sodium-23
23Na