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Which of the following correctly distinguishes the element iron (Fe) from nickel (Ni) on the periodic table?
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2. Atoms & Elements
Periodic Table: Element Symbols
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Atoms of which element contain 25 protons?
A
manganese (Mn)
B
aluminum (Al)
C
magnesium (Mg)
D
tin (Sn)
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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: aluminum (Al), magnesium (Mg), tin (Sn), and manganese (Mn).
Compare the atomic numbers to find which element has exactly 25 protons.
Remember that the atomic number is usually written above the element symbol in the periodic table, so identify the element with atomic number 25.
Conclude that the element with 25 protons is manganese (Mn).
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