Basic Physics of Nuclear Medicine/Atomic & Nuclear Structure MCQ

{Electrons are positioned: |type="()"} - inside the nucleus + outside the nucleus || Correct Answer - see Atomic Structure. - both inside and outside the nucleus - at all of the above locations {Mass Number is defined as: |type="()"} + the number of protons plus the number of neutrons in a nucleus || Correct Answer - see Classification of Nuclei. - the number of neutrons in a nucleus - the complement of the Atomic Number - the number of protons in a nucleus {An atom can be considered as consisting mostly of: |type="()"} - isotopes + empty space || Correct Answer - see Atomic Structure. - water - neutrons {The number of known isotopes is roughly: |type="()"} - 5,000 + 2,500 || Correct Answer - see Radioactivity - 1,000 - 100 {Atomic Number is defined as: |type="()"} - the inverse of the Mass Number - the number of protons plus the number of neutrons in a nucleus + the number of protons in a nucleus || Correct Answer - see Classification of Nuclei. - the number of neutrons in a nucleus {The radius of a nucleus is how much smaller than that of an atom: |type="()"} - 10 times - 100 times - 1,000 times + 10,000 times || Correct Answer - see Atomic Structure. {For an atom to be electrically neutral, the number of: |type="()"} + protons equals the number of electrons || Correct Answer - see The Nucleus. - neutrons equals the number of electrons - protons equals the number of neutrons - protons equals the number of nucleons {Nuclear binding energies are usually expressed in units of: |type="()"} - keV + MeV || Correct Answer - see Binding Energy. - joules - eV {The Hydrogen-3 nucleus (also called Tritium) consists of: |type="()"} + two neutrons and one proton || Correct Answer - see Classification of Nuclei. - two protons and one neutron - two neutrons and two protons - two neutrons and no protons {Isotopes are nuclei with: |type="()"} - same A and Z + same Z, different A || Correct Answer - see Classification of Nuclei. - same A, different Z - Z greater than A {Radioactivity is the process of: |type="()"} + an unstable nucleus becoming stable || Correct Answer - see Nuclear Stability. - an electron moving to a higher energy shell - an electron moving to a lower energy shell - a stable nucleus becoming unstable {The number of protons in a nucleus is expressed by the symbol: |type="()"} - A + Z || Correct Answer - see Classification of Nuclei. - X - M {How many neutrons are in a Uranium-235 nucleus? |type="()"} - 235 - 146 - 92 + 143 || Correct Answer - see Classification of Nuclei. {The two main parts of an atom are called: |type="()"} - nucleus and protons - atom and molecule - molecule and electron + none of the above || Correct Answer - see Atomic Structure. {Which of the following is the smallest? |type="()"} - a molecule - an atom - a nucleus + an electron || Correct Answer - see Atomic Structure. {Which one of the following is a nucleon? |type="()"} + proton || Correct Answer - see Atomic Structure. - electron - nucleus - molecule {One Atomic Mass Unit is about: |type="()"} - one millionth of a gram - one million, millionth of a gram - one million, million, millionth of a gram + one million, million, million, millionth of a gram || Correct Answer - see Atomic Mass Unit. {In the symbol Cs-137, the number 137 represents: |type="()"} + the mass number || Correct Answer - see Classification of Nuclei. - the number of electrons - the atomic number - Avagadro's number