Which of the following is typical of an endothermic reaction?

the reaction container is warm.
the reaction container is cold.
light is a product of the reaction.
sound is a product of the reaction.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

answerlinnaeus;