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Answer :
- Ionization energy decreases down a group.
- The order of elements is Be, Ca, Sr.
- Ionization energy order: Sr < Ca < Be.
- The correct answer is \boxed{D}.
### Explanation
1. Problem Analysis
The elements beryllium (Be), calcium (Ca), and strontium (Sr) are all in group 2 of the periodic table. Ionization energy is the energy required to remove an electron from a gaseous atom.
2. General Trend
Generally, ionization energy decreases as you move down a group in the periodic table. This is because the outermost electrons are farther from the nucleus and are shielded by more inner electrons, making them easier to remove.
3. Applying the Trend to the Elements
The order of the elements in group 2 is Be, Ca, Sr. Therefore, the ionization energy decreases in the order: Be > Ca > Sr.
4. Expressing the Relationship as an Inequality
This relationship can be written as an inequality: Sr < Ca < Be.
5. Final Answer
Comparing this inequality with the given options, we find that option D matches the relationship: Sr < Ca < Be. Therefore, the correct answer is D.
### Examples
Understanding ionization energy helps predict the chemical reactivity of elements. For example, elements with low ionization energies tend to form positive ions more easily and are more reactive as reducing agents. This concept is crucial in designing batteries, understanding corrosion, and developing new materials with specific electronic properties.
- The order of elements is Be, Ca, Sr.
- Ionization energy order: Sr < Ca < Be.
- The correct answer is \boxed{D}.
### Explanation
1. Problem Analysis
The elements beryllium (Be), calcium (Ca), and strontium (Sr) are all in group 2 of the periodic table. Ionization energy is the energy required to remove an electron from a gaseous atom.
2. General Trend
Generally, ionization energy decreases as you move down a group in the periodic table. This is because the outermost electrons are farther from the nucleus and are shielded by more inner electrons, making them easier to remove.
3. Applying the Trend to the Elements
The order of the elements in group 2 is Be, Ca, Sr. Therefore, the ionization energy decreases in the order: Be > Ca > Sr.
4. Expressing the Relationship as an Inequality
This relationship can be written as an inequality: Sr < Ca < Be.
5. Final Answer
Comparing this inequality with the given options, we find that option D matches the relationship: Sr < Ca < Be. Therefore, the correct answer is D.
### Examples
Understanding ionization energy helps predict the chemical reactivity of elements. For example, elements with low ionization energies tend to form positive ions more easily and are more reactive as reducing agents. This concept is crucial in designing batteries, understanding corrosion, and developing new materials with specific electronic properties.
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