Which of the following is not a valid set of quantum numbers?
Which of the following gives the correct possible values of l for n = 4?
Which of these diagrams correctly shows the electron configuration for the atom with one more electron than the one shown above?




Which is the correct electron configuration for sodium (Na)?
A series of five short lines. The first has an up and a down arrow, and is labeled below 1 s. The second has an up and a down arrow, and is labeled 2 s. The third has an up arrow and no label. The fourth has an up arrow and is labeled 2 p. The fifth has an up arrow and no label. Which element is this? fluorine (F)carbon (C)✔ nitrogen (N)oxygen (O)

sodium (Na)potassium (K)neon (Ne)argon (Ar)
Which of the following is the correct electron configuration for titanium (Ti)?
1s22s22p63s23p64s23d104p5Which element is this? fluorine (F)✔ bromine (Br)chlorine (Cl)krypton (Kr)
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