39. Which electron configuration represents a potassium atom in the excited state?
(1) 1s 2s 2p 3s 3p
(2) 1s 2s 2p 3s 3p4
(3) 1s²2s2p 3s 3p45
(4) 1s 2s 2p 3s 3p545

What shape would a molecule with two bound groups and two lone pairs have?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.