Atomic Structure
I have a neutral atom of zicronium (Zr). How many electrons should there be?
What is the definition of the molar mass? What are the units?
The mass of one mole of a substance, typically expressed in grams per mole (g/mol). It represents the mass of Avogadro's number (approximately 6.02×1023) of particles—atoms, molecules, or formula units—of that substance.
How many protons and electrons are in a 40Ca2+ atom?
20 protons, 18 electrons.
In a neutral atom, the number of _____ and _____ must be the same.
Protons and electrons
How many syllables are in this sentence?
11
How many valence electrons are in one atom of Iodine (I)?
7
Which of the following has the largest mass?
A. 3 mol O
B. 3 mol Cl
C. 3 mol He
D. They all have the same mass.
A. 3 mol Cl
What is the definition of an orbital?
A region where an electron is likely to be found.
Name one reason why the Bohr model (although useful!!!) is problematic / not totally accurate.
One significant limitation of the Bohr model is that it assumes electrons move in fixed circular orbits around the nucleus, similar to planets around the sun.
In reality, according to quantum mechanics, electrons do not follow precise, predictable paths. Instead, they exist in probability clouds or orbitals, where there is a high likelihood of finding an electron in a certain region but no exact path.
What is the largest mammal in the world?
The Blue Whale
Why is the average atomic mass not a whole number on the periodic table?
The average atomic mass of an element represents a weighted average of the masses of all naturally occurring isotopes of that element. This value reflects the real-world distribution of isotopes rather than the mass of any single atom.
Selenium is an element that acts as an essential mineral that can protect thyroid health and help with conditions such as asthma and cardiovascular disease. How many moles are in 5.4 x 10-2 grams of Se (selenium)?
0.000684 moles of selenium (6.84 x 10-4)
What is Aufbau's principle?
Electrons occupy the lowest available energy orbitals before moving to higher-energy ones. This minimizes the energy of the atom and makes it more stable.
Draw me a orbital diagram of phosphorous. Circle the valence electrons.
What is the full name of the "pommel horse guy" from the 2024 Summer Olympics who is now competing on Dancing with the Stars?
Stephen Nedoroscik
An element has two naturally occurring isotopes. Isotope X-63 has a mass of 62.93 amu and an abundance of 69.17%. Isotope X-65 has a mass of 64.93 amu and an abundance of 30.83%. Calculate the average atomic mass of this element.
63.54 amu
Carbonic acid is commonly found in carbonated drinks (soda, seltzer water, etc.) How many grams are in 2.5x1024 molecules of carbonic acid, H2CO3?
257 grams
If an atom has a principal quantum number of 3, the possible sublevels in the atom are
s, p, d (3f does not exist)
During my double block free period I discovered a new element called Sg.It's atomic number is 125. Write the symbol for an atom of Sg with a mass of 258 and 123 electrons.
258125Sg2+
What was the most streamed album of 2023?
Un Verano Sin Ti, Bad Bunny
An element, Z, has an average atomic mass of 28.35 amu and two naturally occurring isotopes. Isotope Z-28 has a mass of 28.00 amu and an abundance of 90%. Calculate the mass of the second isotope, Z-29.
31.5 amu
You have a sample containing 3.50×1024 molecules of glucose (C6H12O6). Calculate the mass of carbon in this sample in grams.
418.51 grams
Write the noble gas notation (or abbreviated) configuration of the element tin. Then, circle the valence electrons.
[Kr]5s24d105p2
Beryllium and fluorine form an ionic compound together. What is the chemical formula for this compound? (Hint: Draw a Bohr model for each atom + Ponder the octet rule)
BeF2
new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter and waning crescent