Multiple choice

What is the determining factor for an element to be kept in a period?

  1. The number of shells in an atom of an element

  2. The number of electrons in outer shell of an atom of an element

  3. The number of protons and neutrons in the nucleus of an atom

  4. The number of neutrons in the nucleus of an atom
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A Correct answer
Explanation

The number of shells in an atom determines its period in periodic table. If an element has one shell, it is kept in first period and so on.

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