Cobalt 59 is a stable isotope and cobalt 60 is an unstable or radioactive isotope these two isotopes differ in the number of

Co-59 and Co-60 differ in the number of neutrons.

Explanation:

Co-59 and Co-60 are isotopes of one another. Isotopes differ from one another as they have different mass number but same atomic number. Mass number is the sum of the number of protons and neutrons. As they have the same atomic number they have same number of protons. They have different number of neutrons.  

Co has atomic number 27. So Co-59 and Co-60 have (59-27) or 32 and (60-27) or 33 number of neutrons respectively.  

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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am i too late?

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