Reações Nucleares: O isótopo do elemento Rubídio de número de massa 85 sofre decaimento segundo a equação a seguir. O número atômico do isótopo que X representa é igual a: *obs: Verifique o número atômico do Rb na Tabela Periódica*

a-) 38
b-) 36
c-) 86
d-) 84
a-) 37

the atomic mass is the bottom number on the element.

-steel jelly

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

all eukaryotic cell have mitochondria : )