1
atom
Atoms of the same element with different number of neutrons.
isotopes
What are the 3 subatomic particles in an atom?
protons, electrons, neutrons
What is the relative charge of a neutron?
0
It is a subatomic particle in an atoms nucleus that has a positive charge.
proton
The number of protons in an atom.
atomic number
What is the relative charge or of proton?
+1
radiation that originates from the cathode and travels to the anode of a cathode-ray tube.
cathode ray
Which Greek philosophers major criticism concerned the idea that atoms moved through empty space.
Aristotle's
Are negatively charged particles that are part of all forms of matter are known as
electrons
the extremely small, positively charged, dense center of an atom that contains positively charged protons and neutral neutrons.
nucleus
What is the relative charge of an electron?
-1
Are atoms of the same element that have different numbers of neutrons
Isotopes
One-twelfth the mass of a carbon-12 atom
atomic mass unit (amu)
A neutral, subatomic particle in an atom nucleus that has a mass nearly equal to that of a proton
neutron
What is the relative charge of proton?
+1
A subatomic particle that is found in the nucleus of an atoms?
neutrons/protons
What is the relative charge of a neutron?
0 its neutral
Who believed that atoms could not be created, destroyed or further divided.
Democritus
This ray, originating from the cathode and traveling to the anode
cathode ray
To calculate neutrons, what do you do?
mass number-atomic number
An element is equal to the number of protons in the nucleus of that element.
Atomic number
The number of protons in an atoms is balanced by the _________________ in the atom so that the atom does not carry a net charge.
number of electrons
Which theory easily explains that the conservation of mass in chemical reactions is the result of the separation, combination, or rearrangement of atoms---atoms that are not creates, destroyed or divided in the process.
Dalton Atomic