What discovery led J. J. Thomson to decide that atoms were not indivisible, but are actually composed of smaller parts?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which of these best describes an ionic bond?

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.