History
Structure
Groups
Periodic Table
Grab Bag
100
Who first named the atom?
Democritus
100
Subatomic particle with a positive charge
protons
100
This group will never combine with any other element naturally.
noble gases
100
The period number tells you...
number of energy levels
100
The number of protons and neutrons is represented by the ...
mass number
200
First person to work on the periodic table
Mendeleev
200
Charge of a neutron
zero - neutral
200
Most reactive metals
alkali metals
200
The semi-conductors on the periodic table are classified as...
metalloids
200
Isotopes are atoms of the same element with different numbers of
neutrons
300
Came up with the model that says electrons travel in fixed orbits around the nucleus
Bohr
300
Particles that make up protons and neutrons
quarks
300
Most reactive nonmetals
halogens
300
Which number can be used to determine the identity of an element?
Atomic Number
300
What noble gas does not have 8 valence electrons?
Helium
400
What experiment did Rutherford use to develop his nuclear model?
Gold Foil Experiment
400
How many electrons can be held in the first energy level?
2
400
All elements in this group have 2 valence electrons (name of the group)
alkaline earth metals
400
Hydrogen's most common isotope has __ proton(s) and __ neutron(s).
1 proton, 0 neutrons
400
Draw a Bohr model for the most common isotope of sulfur.
500
Explain JJ Thomson's Plum Pudding Model.
The atom is positively charged with negative particles embedded throughout
500
The mass of an atom is in the __________ where the ___________ are
The volume of an atom is in the __________ where the ____________ are.
Nucleus; protons and neutrons
Electron cloud; electrons
500
This element is the only one in its group has the same number of valence electrons, but is a different classification from the rest of the elements in its group.
Hydrogen
500
This element has 4 energy levels and is one of the rare earth metals.
Scandium (Sc)
500
Write the 2 types of isotope notation for the most common form of Sodium in nature.
sodium-23
23Na