Dimensional Analysis
How many atoms are in 7.5e–4 g calcium (Ca)?
1.1e19 g Ca
Find the number of neutrons present in Re-187.
112 neutrons
Rb, Ar, Ca
Rb > Ca > Ar
If ℓ is 1, what is its sublevel and shape?
p; dumbbell
How many valence electrons are in nitrogen?
5
How many moles of iron (Fe) are in 7.85 g of Fe?
0.141 mols Fe
If a comet emits the orange light with a wavelength of 623 nm, what is the frequency of this orange light?
4.81e14 Hz
What is the group name of Group 7A?
Halogens
What are the possible values for ms?
+1/2 and -1/2
The following electron configuration belongs to which group?
[Ar]4s23d104p5
halogens
How many gold (Au) atoms are needed to make a 17.4 gram gold ring?
5.32e22 atoms Au
Find the energy of an electron in a Helium atom at n=1.
-8.72e-18 J
Which element is more electronegative, fluorine or barium?
fluorine
If ℓ is 1, what are the possible values for mℓ?
-1, 0, +1
Name the element and what group it's a part of based on its electron configuration: 1s22s22p63s1
sodium, an alkali metal
How many nm/s is 2.5 mile/hour?
(1609.34 meters = 1 mile)
1.1e9 mi/hr
A silver medal contains 507 grams of silver. What is electron configuration of silver (Ag) when neutral and at its ground state?
[Kr] 5s14d10
Order the elements from highest to lowest ionization energy:
B, Be, C
C > Be > B
Give a possible set of numbers (n, ℓ, mℓ, ms) for 3s
3, 0, 0, +/- 1/2
Which element is diamagnetic, carbon or beryllium?
Beryllium
Convert 2.00 g/s to kg/hr
7.20 kg/hr
Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron transitions from the n = 8 to the n = 5 principal energy level.
3740 nm
What are the 7 metalloids?
B, Si, Ge, As, Sb, Te, Po
How many electrons can n=3, mℓ=0 have?
6
Element A has two naturally occurring isotopes, 16A with an atomic mass of 15.994915 amu, and 17A with an atomic mass of 16.999131 amu. The average atomic mass of A is 16.00 amu. The percent abundances of the isotopes 16A and 17A respectively are:
99.5%, 0.5%