Give the number of protons, neutrons and electrons in a Calcium-39 atom. Write the
nuclear symbol.
If you could explain the process of finding your answer, I'm just really confused.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Gymnast always perform on padded mats. how does the mats protect the gymnast

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8