Write the electron configuration of the elements that corresponds to each of the following descriptions. (Use small letters to write your answer)The group IIA element in the Fourth period
Question
Write the electron configuration of the elements that corresponds to each of the following descriptions. (Use small letters to write your answer)The group IIA element in the Fourth period
Solution
The Group IIA element in the fourth period of the periodic table is calcium (Ca).
The electron configuration of an atom describes the distribution of electrons in the atom's atomic orbitals. For calcium, the electron configuration is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
This means that there are 2 electrons in the 1s orbital, 2 electrons in the 2s orbital, 6 electrons in the 2p orbital, 2 electrons in the 3s orbital, 6 electrons in the 3p orbital, and 2 electrons in the 4s orbital. This adds up to a total of 20 electrons, which matches the atomic number of calcium.
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