Answer is: P (phosphorus).
Magnesium form cation Mg²⁺, Mg lost 2 electrons, ionic radius decreases.
Aluminium form cation Al³⁺, lost 3 electron, radius decreases.
Phosphorous can form the phosphide anion P³⁻, gain 3 electrons, ionic radius increases.
Sulfur can form anion S²⁻, gain 2 electrons, but have one proton more than phosphorus, so smaller radius.
They are both ionic compounds
Tonga Trench is convergent.
- In the western Pacific Ocean, there is a trench known as the Tonga Trench. It is the second-deepest trench on Earth after the Mariana Trench and the deepest in the Southern Hemisphere.
- The Tonga Trench was created millions of years ago by a process known as subduction, in which two tectonic plates collide and push one under the other.
- The Tonga Trench is 850 miles long and typically reaches depths of 20,000 feet.
- From the southwest corner of the Kermadec Plate to the northwest point of the Tonga Plate, there is a convergent plate boundary known as the Kermadec-Tonga subduction zone.
- The Tonga Trench's Horizon Deep, located at 23.25833°S 174.726667°W, is its deepest point.
- There are numerous volcanoes in the Tonga Trench, both active and dormant, and it is prone to earthquakes and tsunamis.
Learn more about mariana trench here:
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I believe it’s an element