How many moles of sucrose are dissolved in 500 ml of a 1.5 M sucrose solution? A. 0.75 moles
B. 750 moles
C. 0.003 moles
D. 333 moles

B? i feel like this is a trick  

The ground state electron configuration of a phosphorous atom has  three unpaired electrons. they're in the 3p sublevel. the electron configuration is: , for a total of  15 electrons.

Answervolume

Most elements have more than one naturally occurring isotope. as you learned previously, the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same element, but they have different mass numbers (total number of protons and neutrons) giving them different atomic masses. so which mass is put on the periodic table for each element? is it the most common isotope’s mass? the heaviest mass? this activity will answer that question.