Why is a spectrum for a given element unique for that element? a. no element has more than two electrons in the first shell. b. each element has a unique arrangement of electrons. c. atoms of different elements have different masses. d. atomic nuclei contain no electrons.

[08.05] which answer provides the correct name for name the following hydrocarbon? (2 points) moving left to right: a hydrocarbon chain made of a methyl group (ch subscript three) single bond carbon triple bond carbon single bond ch bonded to a methyl group (ch subscript three) and a chain including a methelyne group (ch subscript two) single bond methyl group (ch subscript three). 4-ethyl-2-pentyne 4-methyl-2-hexyne 2-heptyne 4-methy-hexane