All Things Atomic
The number of protons, electrons, and neutrons in vanadium-51.
What is 23, 23, and 28?
Can't be shown here, but has 9 p+ in the center, 2e- in the first shell, and 7e- in the 2nd shell.
These elements are in the same family as Sr and have a larger radius than Sr.
What are Ba and Ra?
They are larger because you are adding electron shells.
What is 36.67?
The chemical formula for cobalt(III) chlorate.
What is Co(ClO3)3?
This has 26 protons and 23 electrons.
What is the iron (III) ion?
This family has 7 valence electrons.
What is the halogen family?
The measure of the ability of atoms of elements to attract electrons to themselves and this element has the highest value.
What is electronegativity and what is F?
The smaller the element, the stronger the attraction. Also, nonmetals want to gain electrons, so the closer to the right, the higher the electronegativity.
The answer to 2.3501 x 0.00440 to the correct number of significant digits.
What is 0.0103?
The molecular mass of xenon tetrafluoride, to 2 decimal places (and with correct units.)
What is 207.25 amu?
1H, 2H, and 3H are examples of this.
What are isotopes?
1s2 2s2 2p6 3s2 3p6 4s1 is its ground state configuration.
What is potassium (K)?
The reason that sodium and potassium react the same.
Why are Na and K in the same family and both have one valence electron?
The mass, in lb, of 1.4 L of lead.
DPb = 11.4 g/mL
What is 35 lb?
x lb = 1.4 L x (1000 mL/1 L) x (11.4 g/1 mL) x (1 lb/453.6 g)
The number of moles in 3.2 g calcium bromide.
What is 0.016 moles?
x mol = 3.2 g CaBr2 x (1 mol/199.90 g)
This was described as a blob of positive charge with negative electrons stuck throughout.
What is Thomson's Plum Pudding Model?
The number of unpaired electrons in an atom of palladium (#46).
What is 2?
Pd ends in a d8. d has 5 orbitals and you must put one in each orbital before going back and doubling up. Therefore it would look like ^√ ^√ ^√ ^ ^
Just pretend that ^ is an up arrow and √ is a down arrow. Then you have two unpaired electrons.
The smaller of S and S2- and why.
What is S? Because S2- has gained two electrons and the more e- repulsion has increased the overall size.
The frequency, in Hz, of 12 cm microwave oven radiation (which is close to a typical WiFi wavelength).
c = 3.00 x 108 m/s
h = 6.626 x 10-34 J•s
What is 2.5 x 109 Hz?
(Is usually expressed as 2.5 GHz.)
v = (3.00 x 108 m/s)/ 0.12 m
The number of atoms in 4.78 g of iron.
What is 5.15 x 1022 atoms?
x atoms = 4.78 g x (1 mol/55.85 g) x (6.02 x 1023 atoms/1 mol)
Element beatonium (Bt) has 2 isotopes - 155Bt at 25.0% abundance and 157Bt at 75.0% abundance. This is beatonium's average atomic mass to one decimal place.
What is 156.5 amu?
avg mass = 155(0.25) + 157(0.75)
On the test this would be a multiple choice and you would probably be able to eyeball the right answer, if you understand the concept.
The shorthand electron configuration for Ta (#73).
What is [Xe]6s24f145d3 ?
The two reasons as to why chlorine has a higher ionization energy than magnesium. (Ok, hard to phrase the answer as question.)
What are: they both have the same number of electron shells but chlorine is smaller, so more difficult to pull away electrons. Also, chlorine wants to gain electrons while magnesium wants to lose electrons.
The energy, in J, of a radio station with a frequency of 1130 kHz.
c = 3.00 x 108 m/s
h = 6.626 x 10-34 J•s
What is 7.49 x 10-28 J?
E = hv = (6.626 x 10-34 J•s)(1.13 x 106 Hz)
The number of moles of aluminum oxide that can be made from 0.350 moles aluminum and excess oxygen gas.
What is 0.175 moles Al2O3?
4 Al + 3 O2 --> 2 Al2O3
x mol Al2O3 = 0.350 mol Al x (2 moles Al2O3)/4 mol Al