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The table below shows some properties and electronic arrangements of common ions of elements represented by letters P to X. Study the information in the table and answer the questions that follow

i).Give the atomic numbers of the elements P and Q
ii).Select the most reactive metallic element
iii).Select 3 elements that belong to the same group of periodic table
iv).Select 3 elements that would react with cold water to evolve hydrogen gas
v).Why is the ionic radius of element X larger than its atomic radius?
vi).Write an equation for the reaction between element S and Oxygen.

Answer Text:
i).P =20
Q =9
ii).R
iii).R, V and W
iv).R, V and W
v).Because it reacts by gaining an electron, this creates repulsion force between the existing and the incoming electron(s) which increases the radius.
vi).#4S_(s) + 3O_(2(g)) --> 2S_2 O_3(s)#