What is the formula of nitrous acid

How is the composition of a meteorite relevant to finding out the composition of earth's core?

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?

Word equation for k+ h2o yield koh + h2