2-Sobre os elétrons  A) possuem cargas positivas e massa elevada
B) possuem cargas positivas e massa, praticamente desprezível
C) possuem cargas negativas e massa, praticamente desprezível
D) possuem cargas negativas e massa elevada

3-Sobre os prótons 
A) possuem cargas positivas e massa elevada
B) possuem cargas positivas e massa, praticamente desprezível
C) possuem cargas negativas e massa, praticamente desprezível
D) Possuem cargas negativas e massa elevada

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.