238 u 92 is an isotope notation. what is the atomic number, mass number, number of protons, and number of neutrons?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice