CHEMISTRY COMMUNITY

melinak1

Yes, they do not notate 4s in the configuration because they took 2 electrons out, to give it a 2+ charge. As stated earlier, they took the electrons out of 4s because it is farther from the nucleus compared to 3d. So it would be harder to take 2 electrons from the d-block compared to the s-block. ...

melinak1

group # of the element

melinak1

Kristina Rizo 3K wrote:Doesn't the octet rule mean that there must be 8 valence electrons on each element?

yes but make sure you also take a look at the octet exceptions

melinak1

Molecules that have exceptions to the octet rule are molecules with an odd number of electrons (ex. NO) , molecules in which an atom or more than one atom have more than 8 electrons (ex. SF6) , and molecules in which an atom or more than one atom have less than 8 electrons (ex. BCl3) . thank you!!!

melinak1

It says on Monday and Tuesday (Nov 4 and 5) that there are review sessions for bonding/structures. There are 4 of them just for bonding/structures so does that mean they are all going to be the same or are they going to go over different stuff/different examples? im sure itll be different examples,...

melinak1

I have class until 5:50 on Friday. Is it still fine if I come to the review session 6-8? What will I miss?

melinak1

Yes, they have the same number of electrons; however, each ion's atomic number is different. This causes varying effective nuclear charges within each ion. For example, for the chlorine ion, the nuclear charge is greater compared to the phosphorus ion and sulfur ion. Despite having the same number ...

melinak1

What kind of questions might there be regarding the Aufbau Principle on a test? Questions regarding the electron configurations of elements. So you must be able to know the principles in order to determine the correct electron configurations or to figure out whether or not the electron is in a grou...

melinak1

Kristina Rizo 3K wrote:I just want to clarify that we can still turn in quantum world hw questions as the 5 questions due in section? I have them done and don't want to find out later that I won't get credit.

yes because we havent moved on to chemical bonds yet

melinak1

What is the relationship between electronegativity and ionization energy? I know Dr. Lavelle said that the atom with the lowest ionization energy is the central atom for a lewis structure, but in high school I learned that the central atom was the most electronegative atom. Is the atom with the low...

melinak1

Greetings Chem 14A students! My name is Karen Leung, one of your UAs this quarter. I will be hosting workshops every Sunday 5-7pm this quarter, and I use worksheets I have made to facilitate my workshops. They will be posted on this SAME post here every week (I'll try to have them posted by Friday ...

melinak1

Angela Prince 3B wrote:I can't find my test grades on ccle, where do I go?

go to the discussion section grades, they should be posted there

melinak1

we can still use a scientific calculator for the exam, right?

melinak1

KTran 1I wrote:
Abraham De Luna wrote:He specified to do either fundamentals or quantum world for homework 2.

Would there be any benefit to do one or the other, such as if one would better prepare us for a test or quiz?

i think so, it couldnt hurt to practice since we dont know whhat the exam will be like

melinak1

Angela Prince 3B wrote:
APatel_4A wrote:He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!

Because it differs so much according to different tables, I think it will be fine if you just remember 700 to 400

thank you!!

melinak1

JOtomo1F wrote:
melinak1 wrote:
505106414 wrote:

what are trailing zeros in the decimal portion?

Here is an example of trailing zeros " 175.00" and that number contains five significant figures.

thank you so much!!

melinak1

andrewcj 4I wrote:One additional thing for my reply, make sure you convert nm to m.

ohh ok thank you!

melinak1

the homework due for this coming week is over quantum only, due during your discussion section

melinak1

so we do receive partial credit?

melinak1

are the final units wirtten in Hz or Js?

melinak1

melinak1 wrote:the molecular formula gives us a more accurate number of how many atoms we are working with, while the empirical formula provides a more vague idea, or ratio, or the atoms that we are working with

that being said, the empirical formula should always be SIMPLIFIED

melinak1

the molecular formula gives us a more accurate number of how many atoms we are working with, while the empirical formula provides a more vague idea, or ratio, or the atoms that we are working with

melinak1

Thank you so much for that Ashley! good luck on your journey

melinak1

505106414 wrote:
JOtomo1F wrote:Here are a couple rules I found online:
Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant.

what are trailing zeros in the decimal portion?

melinak1

is there a consistent rule of how many sig figs there should be? or does it depends on what the problem is asking for?

CHEMISTRY COMMUNITY

Search found 25 matches

Re: Question 2A9

Re: valence electrons

Re: 2B 19

Re: octet exceptions

Re: Midterm review sessions

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Re: Question 1F.3

Re: Aufbau Principle

Re: week 4 Hw problems

Re: Relationship between Electronegativity and Ionization Energy?

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

Re: Test 1 [ENDORSED]

Re: Test 1 [ENDORSED]

Re: Week 2 Homework Problems [ENDORSED]

Re: Wavelength Plausibility

Re: Significant Figures

Re: Uncertainty in Speed [ENDORSED]

Re: Week 2 Homework Problems [ENDORSED]

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

Re: Rydberg equation [ENDORSED]

Re: Empirical Formula Purpose

Re: Empirical Formula Purpose

Re: Advice from a Medical Student - Part II [ENDORSED]

Re: Significant Figures

Re: All students read this sig fig post [ENDORSED]