In the standard model, the particle considered to be an elementary particle is a(n)

• proton
• neutron
• electron
• alpha particle

Which one of the following parts of the atom is the smallest?

• nucleus

• electron

• quark

What is a proton made up of ?

• two up quarks and one down quark
• two charm quarks and three strange quarks
• one top quark and two bottom quarks
• it is indivisible

What is a neutron made up of?

• it is indivisible
• two down quarks and one up quark
• one strange quark and two charm quarks 
• no up quarks and one down quark

What is a electron made up of?

• it is indivisible
• three up quarks and one down quark
• no down quarks and one up quark
• three strange quarks and one charm quark

Often seen with the up quark, its partner in the "first generation of matter", the down quark is slightly heavier and just as fun. In terms of e (the charge of a proton), what is the electric charge of a down quark?

• +2/3 e

• -e

• +e

• -1/3 e

The relative mass of a proton/neutron is.....

• 0
• 1
• 2
• 3

Why is a neutrino so difficult to detect?

• It travels at velocities faster than the speed of light

• It has no electrical charge, so it does not affect nearby particles

• It doesn't really exist

• It has an electrical charge of (−1) and plays an active role in chemical reactions.

The anti-particle of the electron is known as

• Anti-leptons

• positrons

• hadrons

• fermions

Electrons and neutrinos are known as the family of ___

• Leptons

• Hadrons

• Fermions

• Baryons