Discoveries
Believed that all particles are made of wind, water, fire, and Earth
Who is Aristotle?
Dense, neutrally charged mass in the center of an atom
What is the nucleus?
The part of the atom in isotopes that are the same.
What are the protons?
The cause of radioactivity
What is nuclear decay?
This becomes unstable, causing decay.
What is the nucleus?
Discovered the nucleus using the Gold Foil experiment
Who is Rutherford?
Positively charged particles that are also equal to the atomic number
What is the proton?
The most common occurring form of carbon
C 12
This changes in an element and causes radioactivity
What are number of protons?
This particle is made of two protons and two neutrons
What is an alpha particle?
Believed that atoms traveled around nucleus in orbits
Who is Bohr?
The part of the atom that makes up most of it's mass
What is the nucleus?
The part of the atom that is DIFFERENT among the same element's isotopes
What are the neutrons?
Where radiation is released in the nucleus.
What is the nuclei?
This occurs when a neutron atom changes into a proton?
What is beta decay?
First proposed the structure of the atom
Who is Democritus?
Negatively charged particles that orbit around the nucleus
What is electrons?
When written, the element's name is followed by this
What is the mass number?
The two scientists that accidentally discovered radioactivity
Who are Becquerel and Curie?
The types of ray that does not contain particles, but has high energy.
What are gamma rays?
Discovered the neutron
Who is Chadwick?
The currently accepted atomic theory
What is the electron cloud?
This is added to find the mass of the atom
What is the number of protons and neutrons?
Scientists discovered that elements can spontaneously change into new elements when they tried to convert lead into this element.
What is gold?
The two types of decay that result in new elements
What is alpha and beta decay?