Which of the following is not true about the periodic table?

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11. In the periodic table, horizontal rows are called Horizontal rows in the periodic table are known as periods. A. Periods 12. Elements in the same vertical column of the periodic table have Elements in the same vertical column (group) have the same number of valence electrons, leading to similar chemical properties. D. Similar chemical properties 13. Which of the following is not true about the periodic table? Modern periodic tables number groups from 1 to 18. Numbering groups from 1 to 8 is an older or simplified system that doesn't account for all groups. A. The groups in the periodic table are numbered from 1 to 8 14. Which of the following is not true about elements in the same group of the periodic table? Elements in the same group have similar chemical properties and the same number of valence electrons. They are found in different periods. While they share chemical similarities, their physical properties often show significant trends and differences down a group (e.g., state of matter, melting points, densities), so stating they have "similar physical properties" is the least accurate among the options. D. They have similar chemical and physical properties 15. The general name used to describe the group II metals Group II metals are known as alkaline earth metals. B. The alkaline earth metals 16. The group I metals is Group I metals are known as

Which of the following is not true about the periodic table?

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