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Answer :
Answer:
A. Ca, Ba, Be, Sr
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Final answer:
The correct order for decreasing ionization energy for the elements Be, Ca, Sr, and Ba, all of which are alkaline earth metals, is Be, Ca, Sr, Ba, aligning with the trend that ionization energy decreases down a group in the periodic table.
Explanation:
The question asks to place the elements Calcium (Ca), Barium (Ba), Beryllium (Be), and Strontium (Sr) in the correct order for decreasing ionization energy. Ionization energy is the energy required to remove an electron from an atom. It generally increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table. This is because the outer electrons in heavier atoms of the same group are further from the nucleus and are more shielded by inner electrons, making them easier to remove.
Since the elements given (Ca, Ba, Be, Sr) all belong to the same two groups (alkaline earth metals) in the periodic table, we can directly apply the trend that ionization energy decreases as we move down the group. Therefore, the correct order for decreasing ionization energy starts with Be, followed by Ca, then Sr, and lastly Ba, which has the lowest ionization energy.
The correct answer is: Be, Ca, Sr, Ba.
