Atomic Theory
Which scientist thought all matter is made of small pieces that could not be cut into smaller parts called "atomos"
Democritus
The element that has an atomic symbol of H
Hydrogen
The smallest particle of an element that still contains the same characteristics of that element is called a(n)
atom
This is the abbreviation of an element's name is the ____
Atomic Symbol
In this state of matter the particles are tightly packed together and barely vibrate
Solid
The particle that JJ Thomson discovered
electrons
Most of the elements on the periodic table are ____
The positive charged particles in a nucleus
protons
The horizontal row on the Periodic Table is called a ____
period
In this state of matter the particles have the MOST energy
Gas
According to Rutherford, what was in the center of an atom
nucleus
These are poor conductors of electric current
Non-Metals
The negatively charged particles found outside the nucleus
electrons
The vertical column of elements on the Periodic Table is called a ____
group
A scientist shares their procedure with another scientist who then does the exact experiment.
Replication
Bohr
These elements have characteristics of both metals and non-metals
Metalloids
The neutral charge or no charged particle found in the nucleus
neutron
The item on the table that represents the number of protons in the in the nucleus
Atomic Number
A chemist measures the timing of a chemical reaction several times.
Repetition
Who was the first scientist to prove atoms exist and compared them to a billiard ball?
John Dalton
This element's atomic symbol is Fe
Iron
The center of an atom that contains both protons and neutrons
nucleus
The total number of protons and neutrons in the nucleus is represented by the ____
atomic mass
Scientific investigations have certain standards, including the ability to be replicated. What is the reason for scientists to replicate an investigation?
Other scientists need to verify the results to make sure the investigation is valid.