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Increase in atomic size down the group i...

Increase in atomic size down the group is due to

A

increases in number of orbit

B

increases in number of protons and neutrons

C

increase in number of protons

D

increase in number of protons neutrons and electrons

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**Step-by-Step Solution:** 1. **Understanding Atomic Size**: Atomic size refers to the distance from the nucleus to the outermost shell of electrons in an atom. As we move down a group in the periodic table, the atomic size tends to increase. 2. **Identifying the Trend**: When moving down a group, such as from Hydrogen (H) to Lithium (Li), Sodium (Na), and Potassium (K), we observe that the atomic size increases. This is a consistent trend across all groups in the periodic table. 3. **Reason for Increase in Atomic Size**: The primary reason for the increase in atomic size down a group is the addition of electron shells (or energy levels). Each successive element down the group has an additional electron shell. - For example: - Hydrogen has 1 shell. - Lithium has 2 shells. - Sodium has 3 shells. - Potassium has 4 shells. 4. **Impact of Additional Shells**: The increase in the number of shells means that the outermost electrons are located further away from the nucleus. This greater distance results in a larger atomic radius. 5. **Other Factors Considered**: While the number of protons and neutrons also increases as we move down a group, this does not significantly affect the atomic size. The size of the nucleus remains relatively constant, and the increase in protons does not counterbalance the effect of the added electron shells. 6. **Conclusion**: Therefore, the increase in atomic size down a group is primarily due to the increase in the number of electron shells or orbits. **Final Answer**: The increase in atomic size down the group is due to the increase in the number of orbits (electron shells). ---
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