How are isotopes defined?
a. forms of different elements that have the same number of neutrons in each atom
b. forms of different elements that have the same number of protons in each atom
c. forms of the same element that differ in the number of neutrons in each atom
d. forms of the same element that differ in the number of protons in each atom

The correct answer is... C. forms of the same element that differ in the number of neutrons in each atom

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.

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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