Atomic History
This Ancient Greek Philosopher first proposed the idea of the atom
Who is Democritus
This particle is the building block of all matter in the universe
what is an atom
This element has the highest atomic radius of period 3
What is Sodium
This subatomic particle has a neutral charge and lives in the nucleus
what is the neutron
This man created the periodic table in 1869
Who is Dmitri Mendeleev
Ernest Rutherford did this experiment which discovered the proton and the nucleus
What is the Gold Foil Experiment
What is an isotope
This element has the lowest ionization energy of group 2
What is Radium
what is the proton
Argon (Ar) has this many protons
what is 18
JJ Thomson performed the cathode ray experiments in order to discover this subatomic particle
This number is given as a whole number and is the sum of the neutrons and protons in an atom
Mass number
Atomic radius is the measure of this.
What is the size of the atom
This subatomic particle orbits the nucleus and has almost no mass
what is the electron
A typical Oxygen atom has a mass number of this
What is 16
John Dalton proposed this number of postulates about the newly theorized atom
what is 5
These are ions with a positive charge
cations
This periodic trend increases from top to bottom and from right to left
what is atomic radius
These two subatomic particles have roughly the same mass
what are protons and neutrons
A 1- anion of Fluorine has this many electrons
10
The invention and development of these tools allowed chemists to more accurately measure elements and come up with the three laws of matter
what are balances/scales
These ions are negatively charged ions
what are anions
This periodic trend increases from bottom to top and from left to right
What is ionization energy
These are atoms that have either a positive or negative charge
what are ions
A 2+ cation of Sulfur has this many electrons
what is 14