If an element has 12 protons and 17 neutrons, how many electrons must it have?
12. Negative charge must equal positive charge since all elements are neutral.
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To determine the number of electrons in an element, you need to know the element's atomic number, which is equal to the number of protons in the nucleus. In this case, you've mentioned that the element has 12 protons.
An atom is electrically neutral, which means it has an equal number of protons and electrons. So, the number of electrons would also be 12.
In summary, an element with 12 protons and 17 neutrons would have 12 electrons.