A pH scale reading 13 indicates a options - strong base, weak acid, weak base, strong acid

For the following, determine the type of reaction and then give products.

What is the percentage composition of carbon in the compound ch4

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?