Fill in the orbital diagram for a ground state nitrogen atom: How many unpaired electrons are in the 2p subshell?

For the element, strontium, which pair of ionization energies has the largest difference between them?

What is the correct ground state electron configuration for the nickel (III) cation?  

If an electron has a principal quantum number (n) of 4 and an angular momentum quantum number (l) of 0, the subshell designation is             .

Electron affinity (EA) generally increases (ΔEA becomes more negative) from left to right on the periodic table. However, chlorine has a more negative EA than argon.  Which statement best describes why?

What is the color of visible light that has a frequency of 7.10 x 1014 Hz?

Fill in the orbital diagram for a ground state fluorine atom: How many unpaired electrons are in the 2p subshell?  

Which of the following is most likely to be found in a patient with chronic, severe gastroesophageal reflux disease (GERD)?

A 20 year old college student presents in the emergency room with the chief complaint of chest pain and dyspnea. She denies fever, chills, cough, sore throat and smoking. Findings suggest spontaneous pneumothorax. Which finding with palpation would support the diagnosis of pneumothorax?

Which of the following is a sign of chronic occlusive peripheral arterial disease in the lower extremity?