He first theorized that all matter was divisible down to an atom, an indivisible particle
Who is Democritus?
100
The neutral particle in an atom.
What is the neutron?
100
The average atomic mass for carbon.
What is 12.01
100
The vertical rows of the periodic table, or groups, share these.
What are physical and chemical properties.
100
Metallic Character shares a trend direction with this other periodic trend.
What is atomic radii.
200
Organized the periodic table by atomic mass.
Who is Mendeleev?
200
Only the protons and the neutrons add up to account for this.
What is atomic mass?
200
The overall charge of a nucleus?
What is a positive charge?
200
The 2nd group of the periodic table.
What is the alkaline earth metals?
200
As the metallic character decreases, the ionization energy does this.
What is increases.
300
Mosely organized the periodic table by this number.
What is the atomic number?
300
The number of protons, or atomic number, is directly proportional to this sub atomic particle.
What is the electron?
300
One is the neutrons plus protons, the other is the average of all the isotopes.
What is the mass number and the atomic mass?
300
Has a full valence shell, is a noble gas, and found in the 4th energy level.
What is krypton?
300
This element becomes a +3 cation and is in energy level 3.
What is Aluminum?
400
This experiment, designed by Rutherford, helped to discover the proton.
What is the Gold Foil Experiment
400
These are generally unreactive and their atoms have full valance shells.
What is a noble gas?
400
There are 2 isotopes of a particular element. The other percent abundance is 46.34%. This is the first abundance.
What is 53.66%?
400
These elements share both the properties of metals and non metals.
What is a metalloid.
400
The more electrons that are around the nucleus, the stronger the force between the nucleus and the electrons, making it harder to pull an electron away. This explains this trend.
What is ionization energy.
500
Thompson used this tool to discover the electron by shooting fast moving negatively charged particles at an atom.
What is the cathode ray.
500
Dalton theorized that subatomic particles could not be split in this idea.
What is atomic theory?
500
An unknown element has 2 common isotopes, 46 and 47. The 46 has an abundance of 37.24%. What is the average atomic mass?
46.6276
500
This element would be diatomic, and the halogen with the greatest atomic mass.
What is Astatine?
500
As the ionization energy increases across one period, the atomic mass does this.