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Which Element AM I?

Across
I am very valuable with my 79 protons.
I am used to help to make teeth and bones strong with my 20 electrons.
I am used to make Superman weak with my atomic mass number of 84.
I am used to make bleach with my atomic mass number of 35.
I am good for your body and I am found in bananas with atomic mass number of 39.
You need me to breathe and my atomic mass number is sweet 16.
My chemical symbol is Fe.
I am highly reactive and I combine with chlorine to make salt.
I am used to make batteries and I have three electrons in period two.
I am used to make signs and I have 10 protons.
Down
I belong in the third period with 16 protons.
You might take me as a vitamin or mineral supplement but I have 30 electrons.
I have six protons.
You might find me in your pocket but I have 28 electrons.
I am the smallest and lightest element with my might one proton.
I am the only metal that is a liquid at room temperature with 80 protons.
Back in the day I was used to make pennies and I have 29 protons.
I may need to lose some weight because my atomic mass number is 27.
I am the only one in this group with two electrons.
I was a character in the Wizard of Oz with 69 neutrons.