Animals and Plants won't have a place to live, get food and resourses. Some organisms won't have anyshelter, because some live in the water.
Arsenic, I believe. Metalloids fall in between metals and nonmetals (usually on the bold line separating the two on the periodic table). And since the metalloid in question has four electron shells and five valence electrons in the outermost shell, you can see that this element is arsenic
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<span>351.4020 g/mol which is 3.51 x 10</span>∧ 2 g/mole