Isotopes= a group of atoms with the same no. of protons , but different no. of neutrons
Hydrogen isotopes

The name of the second isotope is deuterium and the name of the third isotope is tritium(radioactive).The most abundant isotope is
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based on this ball and stick model how many oxygen atoms are there in a milecule of 2 propanol
Explanation:
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Each orbit has a specific energy level.
Would you mind marking it the brainliest:).
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It is a eukaryotic cell because prokaryotes don't have a nucleus, rather, they have a nucleoid.