<span>Answer:
Yes, the n for potassium would be 4, and for neon would be 2.
Just count which row of the periodic table you are on.
The "L" tells you whether the highest-energy electron is in
an "s" orbital (L=0) or a "p" orbital (L=1) or a "d" orbital (L=2) or an "f" orbital (L=3).
The manner in which these orbitals are filled is:
for each of the first three rows (up to argon),
two electrons in the "s" orbital are filled first, then 6 electrons in the "p"orbitals.
The potassium row also starts with filling the "s" orbital at the new "n" level (4)
but then goes back to filling up the "d" orbitals of n=3 before it fills up the "p"s for n=4.
OK, so potassium has n=4, L = 0, while neon has n=2, L = 1.
The quantum numbers connected with "an element" are always referring to the
highest-energy electron, i.e., the one that was absent in the predecessor element
of the periodic table. When you go from potassium to calcium,
you still get n=4, L = 0, because there are two positions in the "s" orbital.
But when you go from calcium to scandium, suddenly you go back to n=3, L = 2 ("d" orbital).</span>
In a chemical formula, subscripts indicate the elements' ratio. Changing the subscripts would change the identity of the chemical. For example CO2 = carbon DIoxide, but CO = carbon MONoxide.
When salt is added to ice , it comes into contact with the thin layer of water on the surface of the melting ice. ... This salt water has a lower freezing point, so the temperature of the ice bath can get even colder, thus freezing the ice cream more quickly.
Sr is the most reactive. Correct me if I'm wrong :/
Answer:
1.81 x 10²⁴atoms
Explanation:
Given parameters:
Number of molecules = 3 moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem, we are going to use the mole concept.
1 mole of any substance contains 6.02 x 10²³ atoms
So
3 mole of propanone will contain 3 x 6.02 x 10²³ atoms = 1.81 x 10²⁴atoms
