HELP ASAP Explain what is wrong with the following electron configurations. Then annotate the configuration to correct the error . a) 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6
b) 1s2 2s2 2p6 3s3 3d5

Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen. in an experiment, the molar mass of the compound was determined to be 118.084 g/mol. what is the molecular formula of the compound? for both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.

Which element is least likely to undergo a chemical reaction