Different isotopes of the same element must have a different

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

The biosphere of the earth is made up of what compound? organic or inorganic?

Helium decays to form lithium. which equation correctly describes this decay?