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15-Jun-2018 09:17

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Since all atoms of the same element have the same number of protons, different nuclides of an element differ in the number of neutrons they contain.

For example, hydrogen-1 and hydrogen-2 are both nuclides of the element hydrogen, but hydrogen-1's nucleus contains only a proton, while hydrogen-2's nucleus contains a proton and a neutron.

But corals can do this, for as they grow they record in their bodies how many days they experience each year.

In other words, the age should lie between 197.2 million years and 203.6 million years.