1. what are valence electrons? a) empty spaces in the innermost shell of an atom b) electrons in the outermost shell available for bonding c) empty spaces in the outermost shell of an atom d) electrons in the innermost shell available for bonding 2. an atom has an atomic mass of 56amu. the atom has 32 neutrons and 24 electrons. what is the number of the atom? a) 32 b) 24 c) 56 d) 112

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.

X-ray crystallography is used to see the structure of molecules. scientists have used the technique to find the structure of cholesterol an important biological molecules knowledge of a structure of cholesterol is because it may affect?

In an electric circuit, what is one material that the connector can be made of? a. rubber b. aluminum foil c. glass d. wood