Question

On another planet, the isotopes of titanium have the following natural abundances. What is the average atomic mass of titanium on that planet? How many protons are in an ion with 10 electrons and a -1 charge? How many total electrons are in a Ba^2+ ion? What is the charge on a hypothetical ion with 75 protons and 71 electrons?

Answer 1

Average atomic mass = 45.95263*0.746) + (47.94795*0.166)+ (49.94479 *0.088)= 46.635

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-1 charge in an ion signifies that one electron is extra. Number of proton is 9.

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Atomic number of Ba = 56. Ba^2+ has 56-2 = 54 electrons

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there is 4 extra +ve ion (proton) in the ion . The charge is +4