Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A. 0
B. 1
C. 9
D. 11

Evaluate this exponential expression,8. (2 + 3)2 – 42

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?