Protons
Which atom has only one proton?
Hydrogen
What are neutrons made of?
One up quark and two down quarks.
What did Thomson use to discover electrons?
Cathode-ray tubes
All matter is made out of atoms which are indivisible.
Old Atomic Theory (Modern Atomic Theory: Atoms are not indivisible; they are composed of subatomic particles)
Who first introduced the atom?
Democritus
True or False: An electron is heavier than a proton.
False
Which subatomic particle is heavier? Neutrons or Electrons.
Neutrons are 1839 times heavier than electrons.
What causes an electron to move?
Electromotive force, EMF, or voltage
Atoms can be destroyed.
Modern Atomic Theory (fission)
What does atomos mean?
Indivisible
One proton equals how many AMU?
1 AMU
How are neutron stars created in the universe?
Neutron stars are formed when a massive star runs out of fuel and collapses (supernova).
What is the electron's antiparticle?
Positron
Atoms are composed of subatomic particles.
Modern Atomic Theory
About how many atoms are within an average man?
7 x 1027Atoms
What kind of therapy can you use to treat cancer other than radiation therapy?
Proton Beam Therapy
Proton therapy is more precise than radiation therapy. Because proton beams can be much more finely controlled, specialists can safely deliver higher doses of radiation to tumors when needed.
True or False: There is an atom that doesn't have neutrons.
True
Hydrogen (Protium - 1H1) is the only element that does not contain any neutrons in its nucleus.
What makes up an electron?
An electron is considered to be an elementary particle.
Atoms of one element are identical to each other in their mass, size, and shape.
Old Atomic Theory (New Atomic Theory: There can be atoms of the same element which are not identical Isotopes.)
About 74% of all the atoms in the Milky Way galaxy are?
Hydrogen Atoms