5 points
Which group of organisms, some of which were preserved in fossils in
early Paleozoic rocks, are still in existence today? *
Brachiopods
grapolites
euryterids
trilobites

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?

What is a number added in front of a formula in order to balance the equation

Describe the properties of sodium, chlorine, and sodium chloride