The representative elements are also called the group a elements. consider these representative elements: li - group 1a c - group 4a cl - group 7a. what does the group number tell us about the electron arrangement of representative elements? a) number of sublevels filled b) number of electrons lost when forming compounds c) number of electrons in the outermost energy level d) number of energy levels in the atoms of each group

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

What is the mass of 0.46 mil of mgcl2

Compare and contrast solutions and suspensions