Pls help. 20 points. Use periodic trends on the periodic table to predict the following. i. How does calcium's atomic radius compare to magnesium's (Mg) radius and
potassium's (K) radius? Explain your answer.
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ii. How does calcium's first ionization energy compare to the first ionization energy of
magnesium and potassium? (4 points)
iii. Would calcium's chemical properties resemble those of magnesium or those of potassium?
Explain your answer. (4 points)

i. Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

On moving from left to right  ( Mg, K) in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.

As moving from top to bottom, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases.

Thus the order of atomic radii is : Ca > Mg > K

ii. The energy required to remove the last valence electron from isolated gaseous atom (first ionization energy) increases as we move from left to right in a period. It decreases on moving from top to bottom.

Thus the order of first ionization energy is : K > Mg > Ca

iii. The chemical properties depend on the valence elctrons and as the elements Mg and Ca both have two valence electrons , they have same chemical properties.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?