To determine which set of atomic numbers belongs to alkali metals, we first need to identify the atomic numbers associated with alkali metals. Alkali metals are found in Group 1 of the periodic table and include the following elements:
1. Lithium (Li) - Atomic number 3
2. Sodium (Na) - Atomic number 11
3. Potassium (K) - Atomic number 19
4. Rubidium (Rb) - Atomic number 37
5. Cesium (Cs) - Atomic number 55
6. Francium (Fr) - Atomic number 87
Now, let's analyze the options provided in the question:
1. **Identify the atomic numbers of alkali metals**: We have already listed the atomic numbers of alkali metals above.
2. **Examine the options**: We need to check each option to see if it contains any of the atomic numbers listed above.
3. **Eliminate incorrect options**: If an option contains atomic numbers that do not belong to the alkali metals, we can eliminate that option.
4. **Select the correct option**: The option that contains only the atomic numbers of alkali metals is the correct answer.
### Step-by-Step Solution:
1. **List the atomic numbers of alkali metals**:
- Lithium (Li) - 3
- Sodium (Na) - 11
- Potassium (K) - 19
- Rubidium (Rb) - 37
- Cesium (Cs) - 55
- Francium (Fr) - 87
2. **Check the given options**: (Assuming the options are provided in the question)
- Option A: (example: 3, 11, 19)
- Option B: (example: 12, 20, 30)
- Option C: (example: 37, 55, 88)
- Option D: (example: 3, 19, 37)
3. **Eliminate incorrect options**:
- Option A: Contains 3, 11, 19 (All are alkali metals) - Keep this option.
- Option B: Contains 12, 20, 30 (None are alkali metals) - Eliminate this option.
- Option C: Contains 37, 55, 88 (37 and 55 are alkali metals, but 88 is not) - Eliminate this option.
- Option D: Contains 3, 19, 37 (All are alkali metals) - Keep this option.
4. **Select the correct options**: The correct options are A and D, as they contain only alkali metal atomic numbers.
### Final Answer:
The sets of atomic numbers that belong to alkali metals are those that include 3, 11, 19, 37, 55, and 87.
