Which of these substances are molecules?
1.h2o
2.naci
3.n2
4.o2
answer choices
a) 1& 2
b) all of them
c) none of them
d) 3& 4

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?

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?

Which is an example of a highly unstable isotope that is often used in fission reactions?