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Atomic & Quantum Theory

nodal sphere and angular node in 3d(x²-y²)

Draw angular node and nodal sphere of 3d(x²-y²)

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Number of electrons in an electron sea

I have no idea where to begin on this problem:

How many electrons are in the electron sea of a 4.84 g sample of potassium metal?sample of potassium metal?

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calculating wavelength and energy from Atomic spectra

I need helping finding the wavelength distances for H lines and an unknown and the the scale factor. Then calculate the wavelength and energy. I have my lines of H and my unknown mapped out already just not sure how to proceed.

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the United States and is used to feed

It now easily in the race for the most famous of states and Women's World Cup in 2003, and more than expected women in the world in 1999, as well as in terms of preference year, to embrace those dreams, two years after the event. See ultimate team filled the chairs, such as Brazil, Argentina and Mexico in the United States and is used to feed. Racing dreams of global importance this is not the Gold Cup, which has problems of resonance beyond football hardcore, and it's not the World Cup of women, many still do not even try. This is an event that will feature Lionel Messi and Neymar, Sergio Aguero and Arturo Vidal. They refuse to pull FIFA coins buoys MLS. It will attract people who prefer to Spain and Italy's hard to imagine a football fan North of men who are not enthusiastic about this event America, but this does not fully meet the demand soccer.It clear why the Premier League? Why did this event come to the United States? This is the championship of South America, is not it? Certainly, there is a tradition of the CONCACAF finished the Copa America, but still do the tournament in South America. Why South American Championship which will be held in the garden of the CONCACAF go? On the occasion of the 100th anniversary of the continental title, South America clearly wants to do something special. That is why they carry the tournament every four years in the year, after all.Indifference, and the world is now rushing to take advantage of decades of growth.

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Quantum Chemistry involving Energy Levels in an atom

Can you explain how the energy levels in an atom works?

I don't quite understand the general concept. Thanks!

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Formation of ions statements true/false

Which concerning ion formation is/are correct?

A) elements with large electron affinities tend to form monatomic anions
B) no ionic compounds are found with positive ions having charges greater than the element group number
3) group 1A and 2A metals always have a positive charge equal to their group number in their ionic compounds

Skill: 
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Energetically favorable? No clue need help

Which monatomic ion of oxygen is the most energetically favorable?

O2-
O2 positive
O4 positive
O-
O6 positive

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Need a Lewis dotStructure drawing for magnesium sulfide

Lewis dot structure
For magnesium sulfide?

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DifferenceIn rapids greatest for elements

Which of the following is the difference greatest?
A) Li and I
B) O2- and F-
C) K and Br
D) Na and Mg
E) C and F

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Photon wavelengths with frequency 71.6 THz

What is the wavelength of a photon having a frequency of 71.6 THz?

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