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In the periodic table, what is each horizontal row called?
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4. Atoms and Elements
Periodic Table: Classifications
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Which element has protons in its nucleus?
A
Nickel (Ni)
B
Cobalt (Co)
C
Chromium (Cr)
D
Iron (Fe)
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Understand that the number of protons in the nucleus of an atom defines the element's atomic number.
Recall that each element on the periodic table is uniquely identified by its atomic number, which equals the number of protons.
Look up the atomic numbers of the given elements: Nickel (Ni), Cobalt (Co), Chromium (Cr), and Iron (Fe).
Identify which element has an atomic number of 26, meaning it has 26 protons in its nucleus.
Conclude that the element with 26 protons is Iron (Fe), as its atomic number is 26.
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