Multiple Choice
Which neutral element has 89 electrons?
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2. Atoms & Elements
Periodic Table: Element Symbols
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Which element on the periodic table has 78 protons?
A
Lead (Pb)
B
Iridium (Ir)
C
Platinum (Pt)
D
Gold (Au)
Verified step by step guidance1
Recall that the number of protons in an atom is called the atomic number, which uniquely identifies each element on the periodic table.
Look up the atomic numbers of the given elements: Lead (Pb), Iridium (Ir), Platinum (Pt), and Gold (Au).
Compare the atomic numbers to find which element has exactly 78 protons.
Remember that the atomic number corresponds to the number of protons, so the element with atomic number 78 is the one we are looking for.
Identify the element with atomic number 78 as Platinum (Pt), confirming it is the correct answer.
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