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Calcium (Ca) is a common element in the shells of many marine organisms. Strontium (Sr) atoms can sometimes substitute for calcium atoms in these shells. Which of the following statements best explains this observation?

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Answer is: calcium and strontium have same number of valence electrons.

Beryllium, magnesium,calcium and strontium are alkaline earth metals. The elements have very similar properties. Alkaline earth metals have in common an outer s- electron shell (two electrons).

Electron configuration of calcium atom: ā‚‚ā‚€Ca 1sĀ² 2sĀ² 2pā¶ 3sĀ² 3pā¶ 4sĀ²; calcium has two valence electrons (4sĀ²).

Atomic number of calcium is 20, it means that it has 20 protons and 20 electrons, so atom of calcium is neutral. Ā 

Strontium electron configuration: ā‚ƒā‚ˆSr 1sĀ²2sĀ²2pā¶3sĀ²3pā¶3dĀ¹ā°4sĀ²4pā¶5sĀ²; two valence electrons is 5sĀ² orbital.

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