Among the groups of elements listed below which have the same number of electrons in their highest occupied energy levels?

A. Li, B, C, F

B. Na, Mg, Al, S

C. K, Ca, Rb, Sr

D. N, P, As, Sb

How can you tell whether one glass of water has more thermal energy another, identical glass of water?

What will happen to density of urine when a diabetic excretes too much sugar?

Is there a difference between molecules and particles?

If you accidentally spill a chemical on your skin, what should you do ... Immediately? Next?

What is a valid reason why a scientist might reject a scientific theory

Compared to a phosphorus atom, a P3 - ion has (1) more electrons and a larger radius (2) more electrons and a smaller radius (3) fewer electrons and a larger radius (4) fewer electrons and a smaller radius

1. Crystals of ammonium chloride, NH4Cl, seem to disappear when mixed with water. The resulting clear liquid containing ammonium chloride and water is a A) compound. B) new substance. C) homogeneous mixture. D) heterogeneous mixture. 2.

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.

Which material best absorbs sound waves in a room? a. heavy curtains b. hardwood floors c. brick walls d. cement floors