Early Ideas
The name of the person credited with beginning modern atomic theory.
Who is John Dalton?
The smallest particle of matter that retains the properties of the element.
What is an atom?
This information is provided for each element in the periodic table and it equals the number of protons an element has.
What is the atomic number?
A process in which a substance spontaneously emits radiation
What is radioactivity?
A chart that organizes elements according to their properties.
What is the periodic table?
The occupation of the person who first published a book about modern atomic theory.
What is schoolteacher?
The negatively charged particles that are part of all matter.
What are electrons?
One twelfth of the mass of a carbon-12 atom is equal to this.
What is the atomic mass unit (amu)?
This particle has two neutrons and two protons
What is an alpha particle?
a fast moving electron with a 1- charge
What is a beta particle?
Early philosophers believed that matter was composed of these.
What is fire, earth, water, and air?
The two particles found in the nucleus of an atom
What are protons and neutrons?
This is derived by calculating the weighted average mass of all isotopes of an element.
What is the atomic mass?
A reaction that involves a change in the atom's nucleus
What is a nuclear reaction?
The type of equation that expresses radioactive decay
What is a nuclear equation?
The famous philosopher whose denial of the existence of the atom went unchallenged for two thousand years
Who is Aristotle?
A positively charged particle of an atom
What is a proton?
Atoms with the same number of protons but a different number of neutrons are called this.
What are isotopes?
The charge of a beta particle
What is 1-?
Scanning transmission electron microscopy gathers information at many different angles that ultimately creates three dimensional images of atoms
What is a map?
The Greek philosopher who first expressed the idea that matter is composed of atoms
Who is Democritus?
During the 1800s, scientists used this invention to learn about matters and electric charge.
What is a cathode-ray tube?
0.000549 amu
What is the mass of an electron?
The three most common types of radiation
What alpha, beta, and gamma radiation
high energy radiation that has no mass and is neutral in charge
What is a gamma ray?