Which of the following statements about the modern periodic table is NOT correct?
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A.
There are seven periods in the periodic table
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B.
Period 1 has only one element
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C.
The periodic table is arranged in order of atomic number
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D.
There are 18 groups in the periodic table
Correct Answer:
B. Period 1 has only one element
Explanation:
The incorrect statement is that Period 1 has only one element. In the modern periodic table, Period 1 actually contains two elements: Hydrogen (H) and Helium (He). The other options are accurate descriptions of the table's structure: it consists of seven horizontal periods and 18 vertical groups, and the elements are systematically organized according to their increasing atomic numbers. Therefore, the claim that Period 1 possesses only a single element is the only false statement among the choices.
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