A solution has a pH of 7. Is it considered a(n)

A) acid
B) base
C) neutral substance

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

State one important difference between a physical change and a chemical change?