Which is NOT a property of gold?
A. common
B. malleable
C. good reflector of heat
D. good conductor of electricity

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

What are the similarities of physical and chemical change ?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?