PHYS 165 MODULE 10 ASSESSMENT TEST 2026
TESTED QUESTIONS WITH FULL SOLUTION
GRADED A+
◉ Atom. Answer: from greek "atomos" = indivisible.
were thought to be the smallest part of a substance that still retained
the properties of that substance.
◉ Plumb Pudding Theory / Chocolate Chip Cookie Dough Theory.
Answer: where the pudding/ cookie dough = the atom, and positive
charge is spread out through it.
raisins/ chocolate chips = electrons.
◉ Planetary Model Answer: tightly packed atomic balls that are
positively charged at the nucleus and the electrons orbit the nucleus.
◉ Problem of the planetary model of the atom Answer: when the
electrons orbit the nucleus, they should continually emit
electromagnetic radiation and spiral into the nucleus, but this did
not happen.
, ◉ Bohr Model of the Atom Answer: it starts with the planetary
model and assumes that there is a ground sate of the atom that is
stable and does not emit any energy while in this state.
◉ Borh's assumptions in his model of the atom Answer: 1. the only
time when the electron emits energy is when the electron jumps
orbitals.
2. the energy of the orbiting electrons, and momentum was
quantized
◉ orbital number Answer: En= -13.60 eV/n^2
rn= n^2(5.29x10^-11m)
◉ Electron Cloud Model Answer: the position of the electron is
expressed as a probability cloud.
in a denser cloud it is more likely that the electron is at a certain
position.
the more unlikely the position the less dense the cloud.
◉ Proton and Neutron Answer: Proton :
1932 Ernest Rutherford
TESTED QUESTIONS WITH FULL SOLUTION
GRADED A+
◉ Atom. Answer: from greek "atomos" = indivisible.
were thought to be the smallest part of a substance that still retained
the properties of that substance.
◉ Plumb Pudding Theory / Chocolate Chip Cookie Dough Theory.
Answer: where the pudding/ cookie dough = the atom, and positive
charge is spread out through it.
raisins/ chocolate chips = electrons.
◉ Planetary Model Answer: tightly packed atomic balls that are
positively charged at the nucleus and the electrons orbit the nucleus.
◉ Problem of the planetary model of the atom Answer: when the
electrons orbit the nucleus, they should continually emit
electromagnetic radiation and spiral into the nucleus, but this did
not happen.
, ◉ Bohr Model of the Atom Answer: it starts with the planetary
model and assumes that there is a ground sate of the atom that is
stable and does not emit any energy while in this state.
◉ Borh's assumptions in his model of the atom Answer: 1. the only
time when the electron emits energy is when the electron jumps
orbitals.
2. the energy of the orbiting electrons, and momentum was
quantized
◉ orbital number Answer: En= -13.60 eV/n^2
rn= n^2(5.29x10^-11m)
◉ Electron Cloud Model Answer: the position of the electron is
expressed as a probability cloud.
in a denser cloud it is more likely that the electron is at a certain
position.
the more unlikely the position the less dense the cloud.
◉ Proton and Neutron Answer: Proton :
1932 Ernest Rutherford
