Arrange the following in order of increasing masses of 1 mole of CO32-, PO43-, SO42- Cl- S2- (1)

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

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.

1.solid

2.carbon dioxide

3.helium

it's c (engineer's do their work with mechanical stuff not on any living being)