The number of electron in the valence shell of Strontium is/are ________.

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Solution

The outermost shell of an atom is called the valence shell, and the electrons in that shell are called the valence electrons.
Strontium (Sr) has 38 electrons. K-shell has 2 electrons, L-shell has 8 electrons, M- shell has 18 electrons, N shell has 8 electrons, and valence shell has 2 electrons.
Hence, Strontium (Sr) has 2 electrons as valence electrons.

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