Um átomo apresenta 13 prótons e 14 nêutrons. a carga do íon estável formado a partir desse átomo será:
a)-2
b)-1
c)+1
d)+2
e)+3

a resposta deu letra (e) não

The fact that the total amount of energy in a system remains constant is a(n)

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.