What's in the Atom?
What are the three subatomic particles in an atom?
Protons, electrons, and neutrons
Isotopes are atoms with the same _________ and different number of _______.
1st: protons/element
2nd: neutrons
The Bohr model states that electrons rotate around the nucleus in ________.
Orbitals / rings
What color of visible light has the highest energy?
Violet
What two particles make up the mass number for an isotope?
If two isotopes, Lead-208 and Lead-210, are compared, what would be different about them?
Lead 210 has more neutrons
Different mass numbers
Lead 208 has fewer neutrons
According to the QM model, where are electrons most likely to be found?
closest to the nucleus
What is the relationship between wavelength and energy?
AKA, when one changes, what does the other do?
When wavelength inc, energy dec.
When wavelength dec, energy inc.
Inverse relationship
What has to be balanced in a neutrally-charged atom?
Protons and electrons
How many protons are in an isotope of Magnesium-23?
12
The Quantum Mechanical Model states that electrons exist in a cloud of __________ around the nucleus.
probability
If an element has an electron configuration of 1s2 2s2 2p5 , what element is this?
Fluorine
9 electrons in the electron configuration
a. Where is it located in an atom?
b. What charge does it have?
c. Does it have significant mass?
d. Why is it important to an atom?
a. In the nucleus
b. +1
c. heavy!
d. determines the identity of the atom (which element)
Cobalt has three naturally occurring isotopes:
Cobalt-58, Cobalt-59, and Cobalt-61
If cobalt's average atomic mass is 58.933 g/mol, which isotope of cobalt is most abundant?
Cobalt-59
According to the Bohr model, what would be released when electrons fall from their excited state to ground state?
light / energy
Helium
2 electrons
If an atom has a mass number of 20, and an atomic number of 9, how many neutrons does it have?
11
MN - AN = # of neutrons
There are two naturally occurring isotopes of Neon: neon-10 and neon-12. If the average atomic mass of neon is 11.00 g/mol, which isotope would you predict is more abundant?
What are TWO differences between the QM model of the atom, and the Bohr model of the atom?
Bohr model = exact location of elections, QM model = probability of finding electrons
Bohr model = electrons are found on orbitals/rings, QM = "clouds of probability"
Bohr model = orbitals are shaped like rings, QM = orbits have varied shapes
If we wanted to determine the identity of an unknown compound based on the light released, what is one way we could determine what light is produced?
OR
2. Spectroscope & gas tube