Multiple Choice
In the periodic table, what is a period?
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4. Atoms and Elements
Periodic Table: Classifications
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In the periodic table, which element has the greatest number of protons in its nucleus (i.e., the highest atomic number)?
A
Hydrogen (H)
B
Oganesson (Og)
C
Uranium (U)
D
Lead (Pb)
Verified step by step guidance1
Understand that the number of protons in an element's nucleus is called its atomic number, which uniquely identifies the element on the periodic table.
Recall that elements in the periodic table are arranged in order of increasing atomic number from left to right and top to bottom.
Identify the atomic numbers of the given elements: Hydrogen (H) has atomic number 1, Lead (Pb) has atomic number 82, Uranium (U) has atomic number 92, and Oganesson (Og) has atomic number 118.
Compare these atomic numbers to determine which is the greatest, since the element with the highest atomic number has the most protons.
Conclude that the element with the highest atomic number among the options is the one with the greatest number of protons in its nucleus.
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