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How many valence electrons does an oxygen atom have?

Which two of the following electron configurations represent elements that would have similar chemical properties? (1) 1s22s22p4       (2) 1s22s22p5       (3) [Ar]4s23d5       (4) [Ar]4s23d104p5  

The combustion of 0.374 kg of methane CH4 in the presence of excess oxygen produces 0.983 kg of carbon dioxide. What is the percent yield?

What is the percent yield of a reaction if the product recovered is 21.2 g and the theoretical yield is 28.4 g? (

What is the oxidation number of free elements?

What precipitate forms when mixing copper(II) sulfate and sodium sulfate?

Which protein makes up the thick filaments? 

What is the oxidation number of Mn in a permanganate anion?

Which is the correct balanced reaction for the combustion of octane C8H18 ?

The correct electron-dot structure for HCN shows: