Magnesium is an essential element for plants and animals. Someone comes up with

Question

Magnesium is an essential element for plants and animals. Someone comes up with an idea to use magnesium to precipitate iron in a small lake at the end of a short river that emerges from an iron mine. The idea is to sprinkle magnesium on the lake surface as well as dump it into the center of the lake. If the goal is to precipitate 50,000 grams of iron, what must the iron (III) chloride concentration of the river water be if it takes 32,645 g of magnesium metal filings to obtain that mass of iron, and the volume in which the solid forms is 100,000 L? 2FeCl3 (aq) +3Mg(s)à 3MgCl2 (aq) +2Fe(s)

What is the shell and subshell that electrons enter when forming an anion of each of the Group VIIA nonmetal atoms listed?

k. F

l. Cl

m. Br

n. I

Explanation / Answer

k. F

l. Cl

m. Br

n. I

all these elements belongs to 7A -group elements.so that its general valence electronic configuration is ns^np5

F= 2S2 2P5, if one electron added , it will become F-

F- configuration = 2s2 2p6

shell = p

sub shell = Px(or)Py(or)Pz

similarly

Cl- = 3s23p6

Br - = 4s24p6

I- = 5s2 5p6

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