How can the rate of a reaction be decreased? a.) lowering the temperature b.) increasing the amount of reactants c.) having more surface area d.) adding a catalyst

i’d go with A because the definition of heat is the rate at which molecules move. so the rate of the reaction would increase with an increase of heat most likely. it depends on the type of reaction tho

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

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