Multiple choice

In the modern periodic table, the elements of a group have similar properties because they have the same

  1. atomic number

  2. atomic weight

  3. number of valence electrons

  4. electronic configuration

  5. number of neutrons
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C Correct answer
Explanation

The properties of an element depend on the valence electrons or the number of electrons in the outermost orbit. In a group of modern periodic table, all the elements have the same number of valence electrons. For example, all alkali elements have one electron in their outermost orbit. Hence, they have similar properties.

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