Question

calcium forms the cation ca²⁺. which model can be used to represent the electron - shell structure of the ion?

Explanation:

Calcium (Ca) has an atomic number of 20. The Ca²⁺ ion has lost 2 electrons, so it has 18 electrons. The electron - shell configuration of an 18 - electron species has 2 electrons in the first shell, 8 in the second shell, and 8 in the third shell. We need to find the electron - dot model that represents these 18 electrons arranged in shells around the nucleus for Ca²⁺.

Answer:

We cannot provide the answer as the options (A, B, C, D) are not clearly visible in the provided image. Please describe the electron - dot models in each option for a proper response.