when a calcium atom loses its valence electrons, the ion formed has an electron configuration that is the same as an atom of
(1) Cl
(2) Ar
(3) K
(4) Sc
i think its 2 am i right ?
right
To determine the correct answer, we need to consider the electron configuration of a calcium atom and the ion formed when it loses its valence electrons.
The electron configuration of a neutral calcium atom (Ca) is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s². It has a total of 20 electrons.
When a calcium atom loses its two valence electrons (from the 4s orbital), it forms a Ca²⁺ ion. Since the ion has lost two negatively charged electrons, the electron configuration of the Ca²⁺ ion will be the same as the nearest noble gas, which is argon (Ar).
Therefore, the correct answer is (2) Ar, as the electron configuration of the Ca²⁺ ion is the same as that of an argon atom.