Select the correct answer.
An atom of nitrogen has seven electrons. Which diagram correctly represents the arrangement of these electrons?
111s 1125 1122
111s [I]2s 111 22
111s 112 11 1 20
111s 1]]2s 11 1 20

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils