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Which represents alkali metals based on ...

Which represents alkali metals based on relative `(IE)_(1) and (IE)_(2)` values?

A

`|{:(,(IE)_(1),(IE)_(2)),(X,100,110):}|`

B

`|{:(,(IE)_(1),(IE)_(2)),(Y,800,120):}|`

C

`|{:(,(IE)_(1),(IE)_(2)),(Z,195,800):}|`

D

`|{:(,(IE)_(1),(IE)_(2)),(M,200,250):}|`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which option represents the alkali metals based on their first and second ionization enthalpy (IE1 and IE2) values, we need to understand the characteristics of alkali metals and their ionization energies. ### Step-by-Step Solution: 1. **Understand Alkali Metals**: - Alkali metals are found in Group 1 of the periodic table. They have a single electron in their outermost shell, which is typically in the s-orbital (ns¹ configuration). 2. **Ionization Energies**: - The first ionization energy (IE1) is the energy required to remove the outermost electron from a neutral atom. - The second ionization energy (IE2) is the energy required to remove a second electron after the first has been removed. 3. **Trends in Ionization Energies**: - For alkali metals, removing the first electron (IE1) is relatively easy because they have a single electron in their outermost shell. - After the first electron is removed, the resulting ion has a stable noble gas configuration, making it much harder to remove the second electron (IE2). Therefore, IE2 is significantly higher than IE1. 4. **Analyzing Options**: - We need to look for a set of values where there is a large difference between IE1 and IE2. - Let's evaluate the options: - **Option 1**: IE1 = 100, IE2 = 110 (difference = 10) - Not suitable. - **Option 2**: IE1 = 800, IE2 = 120 (difference = 680) - Not suitable, as IE2 should be higher. - **Option 3**: IE1 = 195, IE2 = 800 (difference = 605) - This is a large difference and suitable. - **Option 4**: IE1 = 200, IE2 = 250 (difference = 50) - Not suitable. 5. **Conclusion**: - The only option that shows a large difference between IE1 and IE2, which is characteristic of alkali metals, is **Option 3** (IE1 = 195, IE2 = 800). ### Final Answer: **The correct answer is Option 3: IE1 = 195, IE2 = 800.**
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