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Answer :
To list the elements P, Cs, Co, and Sr from largest to smallest atomic radius, we need to understand periodic trends in atomic radius. Here are the key points:
1. Atomic Radius Trend:
- Across a Period: Atomic radius decreases from left to right across a period. This is because the number of protons increases, pulling electrons closer to the nucleus.
- Down a Group: Atomic radius increases as you go down a group in the periodic table. This is because each subsequent element has an additional electron shell.
2. Position in the Periodic Table:
- P (Phosphorus): Located in Group 15 (5A), Period 3.
- Cs (Cesium): Located in Group 1 (1A), Period 6.
- Co (Cobalt): Located in Group 9 (8B), Period 4.
- Sr (Strontium): Located in Group 2 (2A), Period 5.
Comparative Analysis:
- Cs (Cesium): Being in Group 1 and Period 6, Cesium has the largest atomic radius among the given elements.
- Sr (Strontium): It is in Group 2 and Period 5, so it has a smaller atomic radius than Cesium but larger than elements in lower periods or different groups.
- Co (Cobalt): As a transition metal in Period 4, it has a smaller atomic radius than Cesium and Strontium.
- P (Phosphorus): Being in Period 3, Phosphorus has the smallest atomic radius among the given elements.
Given the analysis above, the order from largest to smallest atomic radius is:
Cs > Sr > Co > P
Therefore, the correct arrangement of elements from largest to smallest atomic radius is:
Cs, Sr, Co, P
1. Atomic Radius Trend:
- Across a Period: Atomic radius decreases from left to right across a period. This is because the number of protons increases, pulling electrons closer to the nucleus.
- Down a Group: Atomic radius increases as you go down a group in the periodic table. This is because each subsequent element has an additional electron shell.
2. Position in the Periodic Table:
- P (Phosphorus): Located in Group 15 (5A), Period 3.
- Cs (Cesium): Located in Group 1 (1A), Period 6.
- Co (Cobalt): Located in Group 9 (8B), Period 4.
- Sr (Strontium): Located in Group 2 (2A), Period 5.
Comparative Analysis:
- Cs (Cesium): Being in Group 1 and Period 6, Cesium has the largest atomic radius among the given elements.
- Sr (Strontium): It is in Group 2 and Period 5, so it has a smaller atomic radius than Cesium but larger than elements in lower periods or different groups.
- Co (Cobalt): As a transition metal in Period 4, it has a smaller atomic radius than Cesium and Strontium.
- P (Phosphorus): Being in Period 3, Phosphorus has the smallest atomic radius among the given elements.
Given the analysis above, the order from largest to smallest atomic radius is:
Cs > Sr > Co > P
Therefore, the correct arrangement of elements from largest to smallest atomic radius is:
Cs, Sr, Co, P
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