An atom on the period table that requires a relatively substantial amount of energy to remove an electron from its outer shell, and thus a high ionization energy would be Fluorine. Due to its small atomic size, and less electron shells, it has a stronger attraction to electrons in its electron shells and thus it is harder to remove the electron from it.
I believe this would be the solution.
Answer:
When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.
The maximum amount of Magnesium chloride that can be produced is 26.11 grams
calculation
find the moles of each reactant
that is
moles = mass/molar mass
moles of mg = 20 g/ 24.3 g/mol =0.617 moles
moles of HCl =20/36.5 =0.548 moles
write a balanced equation for reaction
Mg +2HCl =MgCl2 +H2
by use of mole ratio between Mg to MgCl2 which is 1:1 therefore the moles of MgCl2 = 0.617 moles
by use of mole ratio between HCl to MgCl2 which is 2:1 the moles of MgCl2 is therefore = 0.548 x1/2=0.274 moles
HCl is the limiting reagent therefore we use the moles MgCl2 derived from HCl, that is 0.274 moles
maximum mass is therefore = moles x molar mass
the molar mass of MgCl2 = 24.3 +(35.5 x2) =95.3 g/mol
maximum mass is therefore = 0.274 x95.3 = 26.11 grams
Last level of atoms of these elements has 2+5= 7 electrons. These elements are located in the 17th group of the Periodic Table, and they are called halogens.