Select all that apply. select all the correct statements about ion sizes below. check all that apply. au3+ is smaller than au+ as3− is smaller than p3−. au+ is smaller than au3+. na+ is smaller than k+. p3− is smaller than as3−. k+ is smaller than na+.

The answer is:
1. Au3+ is smaller than Au+
2. P3− is smaller than As3−
3. Na+ is smaller than K+

1. Au3+ is smaller than Au+ because an atoms get smaller when electrons are removed. So, the more electrons, the greater is the ionic radius. Au3+ has two less electrons than Au+ so Au3+ must be smaller than Au+.
2. P3- is smaller than As3- because P3- has a smaller ionic radius. Although these two ions have the sam number of electrons, they are not the same size. As is located below P in the Periodic table of elements. Going down the group of elements, extra layers of electrons are added resulting in bigger ionic radius. So, As3- has bigger ionic radius than P3-.
3. Na+ is smaller than K+ for the same reason as the P3- is smaller than As3-. Na is located above K in the Periodic table of elements.

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.