Multiple Choice
Periodic Table: Classifications — Who is credited with first publishing a periodic table that organized the elements into a repeating pattern of properties?
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4. Atoms and Elements
Periodic Table: Classifications
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How many horizontal rows (periods) are in the modern periodic table?
A
7
B
8
C
32
D
18
Verified step by step guidance1
Understand that the modern periodic table is organized into horizontal rows called periods, which represent elements with the same number of electron shells.
Recall that each period corresponds to the filling of a principal energy level (shell) with electrons.
Recognize that the modern periodic table includes elements filling up to the 7th principal energy level.
Therefore, count the number of horizontal rows (periods) from the first row (hydrogen and helium) to the last row (elements filling the 7th shell).
Conclude that the total number of periods in the modern periodic table is 7.
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