12. During a flame test, a copper metal compound produces a characteristic green flame. This green color is produced when electrons in excited lithium atoms
A. are lost by the atoms.
B. are gained by the atoms.
C. move to higher energy states within the atoms.
D. return to lower energy states within the atoms.

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

What is the molecular weight of copper

Match these items with their examples. 1. liquid solution milk 2. solid solution aluminum foil 3. compound soda 4. colloid steel 5. element salt