1. Two elements X and Y have the following electronic configurations:X: 1s2 2s22p6 3s2 3p1Y: 1s2 2s2 2p4Which compound are these elements most likely to form? A. X2YB. X3Y2C. X2Y3D. XY3 2. How does the energy difference between successive energy levels in a hydrogen atom change as the principal quantum number increases? A. It increases.B. […]
1. When 4 moles of solid potassium chlorate (KClO3) are heated until it fully decomposes, how many moles of oxygen gas (O2) are produced? 2KClO3 → 2KCl + 3O2 A. 5 moleB. 2 molesC. 12 molesD. 6 moles 2. Which of the following samples contains exactly one mole of molecules? A. 4 gram of
1. A molecule has four electron domains around the central atom: three bond pair and one lone pair. Which description is correct? A. Electron-pair geometry tetrahedral; molecular geometry tetrahedralB. Electron-pair geometry tetrahedral; molecular geometry trigonal pyramidalC. Electron-pair geometry trigonal planar; molecular geometry trigonal pyramidalD. Electron-pair geometry trigonal planar; molecular geometry trigonal planar 2. Which set of
