1) In 1s², what does the 1 represent? a) First energy level b) Second energy level 2) What does the letter p represent in 2p⁶? a) p orbital b) nothing 3) How many electrons can a d orbital hold at maximum? a) 14 electrons b) 10 electrons 4) What is the correct electron configuration of Oxygen (O, atomic number 8). a) 1s² 2s² 2s3 2p4 b) 1s² 2s² 2p⁴

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