Find the atomic number of an element whose atom has the electronic configuration 2, 8, 4.

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Solution

Silicon

Atomic number of silicon = 14

Therefore number of electrons = 14

Thus, electronic configuration of silicon is 2,8,4.

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The electronic configuration of the atom of an element X is 2, 8, 4. In the modern periodic table, the element X is placed in :

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An element 'Z' has the electronic configuration 2, 8. Name the element 'Z' and determine its atomic number.

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