Metallic elements tend to act as Lewis acids and form complexes with a variety of Lewis bases. Since most elements are metals, and almost all metals form complexes, it is important to understand these complexes. Many biological molecules, such as the chlorophyll used by plants to harvest the energy of sunlight, are coordination compounds or compounds containing one or more metal complexes. Arrange the complexes in order of decreasing stability. Rank from most stable to least stable. To rank items as equivalent, overlap them.
1. [Cu(NH3)6]2+
2. [CuF6]2+
3. [Cu(en)3]2+
4. [Cu(en)(H2O)4]2+

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph