What is the enthalpy of reaction?

Drive down any three characteristic of modern periodic table

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

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false