An atom or ion has 42 neutrons , 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion.

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Explanation:

number of electrons=36

number of protons=36

number of neutrons=42

mass number=number of protons+number of neutrons

mass number=36+42

mass number=78

so the element will be krypton Kr

as elements are identified on their number of electrons so this atom is krypton

as the actual atomic mass of krypton is 86 here the calculated atomic mass is 78 so krypton has loss 8 electrons but this must require a great amount of energy so the charge on krypton is +8

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