How many protons, neutrons, and electrons are there in 70Se2- ?

The answer to your question is Protons = 36, Neutrons = 26, Electrons = 36

Explanation:

                                ⁷⁰Se²⁻

The number of protons is equal to the atomic number, Selenium has an atomic number of 34. Then the number of protons = 34.

The number of neutrons = Mass number - number of protons

                                         = 70 - 34

                                         = 36

The number of electrons = number of protons + 2 because of the 2- next to the symbol of Selenium.

Number of electrons = 34 + 2

                                  = 36              

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