Which of the following is an example of a molecule with different atoms? hydrogen - H2

water - H2O

oxygen - O2

helium - He

Classify this reaction: 2al+n2-> aln.

Which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , bent , trigonal pyramidal , linear

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms