Let E be any representative element. Following the patterns in the table, write formulas for the hydrogen and oxygen compounds of the following elements. Answers should be in the form of E2O (for E2O). (a) Sb Compound with hydrogen: Compound with oxygen: (b) Se Compound with hydrogen: Compound with oxygen:  (c) Cl Compound with hydrogen:  Compound with oxygen:  (d) C Compound with hydrogen: Compound with oxygen:

Indicate which choice is the best explanation for the following factual statement: the IE1 of lithium is lower than the IE1 of helium. A) The thrid electron in lithium goes into a new shell further away from the nucleus. This shell will be easier to remove an electron from, and therefore the IE1 is lower. B) The third proton pulls on the extra electron harder, thus lowering the IE1. C) Extra electrons always increase the electron-electron repulsion so the IE1 simply goes down. D) None of the above

23) arrange the following atoms in order of increasing electro negativity  carbon, nitrogen, oxygen, aluminum

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