Atomic Theory Development
The Atom
Forces in Atoms
Arranging the Elements
Grouping the Elements
100
This is the Greek word for "not able to be divided."
What is Atomos
100
This is the SI unit used to express the masses of particles in atoms.
Atomic Mass Unit
100
This is a push or pull between two objects.
Force
100
Who was the Russian Chemist who discovered patterns to the elements and created the first periodic table of elements.
Dmitri Mendeleev
100
These are the most reactive metals and have to be stored in oil.
Alkali Metals
200
This is the first philosopher who thought that you would finally end up with one particle that could no longer be divided.
Who was Democritus
200
This is a positively or negatively charged atom.
Ion
200
This type of force is an important force in radioactive atoms.
weak force
200
This means "happening at regular intervals."
Periodic
200
This is the element found in our bodies, concrete, and chalk.
Calcium
300
This scientist developed the first Atomic Theory.
John Dalton
300
This is the number of protons found in the nucleus of an atom.
Atomic Number
300
This force acts upon all objects at all times.
gravitational force
300
How is the modern periodic table of elements organized.
Increasing atomic number
300
This is the most abundant metal found in the Earth's crust.
Aluminum
400
This Scientist discovered that there were even smaller particles found inside a nucleus, leading to the discovery of electrons.
J.J. Thomson
400
These are the different forms of the same element. They have the same number of protons, but different numbers of neutrons.
Isotopes
400
This is the force that holds the nucleus together.
Strong Force
400
These elements are shiny, malleable, great conductors of electricity, and great conductors of thermal energy.
Metals
400
This group's elements are often used to disinfect, or clean things.
Halogens
500
This is the scientist who discovered the nucleus of an atom.
Ernest Rutherford
500
This is an unstable atom with a nucleus that will change over time.
radioactive
500
This force causes opposite charges to attract and like charges to.
Electromagnetic Force
500
These are the "families" on a periodic table of elements.
Groups
500
Elements listed after plutonium, element 94, are what kind of elements?
Synthetic (made in a laboratories)
M
e
n
u