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Periodic Classifications of Elements
The positions of three elements A, B, and C in the periodic table are shown below:
(a)- State whether A is a metal or non-metal.
(b)- State whether C is more reactive or less reactive than A.
(c)- Will C be larger or smaller in size than B?
(d)- Which type of ion, cation or anion, will be formed by element A?
(a)- A belongs to group 17. This means that it has 7 valance electrons and it needs one electron to complete its octet. So, A will complete its octet by gaining an electron. Thus, A is non-metal.
(b)- Both A and C belong to the same group and have 7 valance electrons. On moving down the group, the size of the element increases because of less electronic attraction. This means that A is smaller than C and the nuclear attraction will be more in A. So, A can quickly complete its octet than C, and hence it is more reactive than C.
(c)- Element C and B belong to the same period. When we go left to right in a period, the number of electrons and protons increases. So, the effective nuclear charge will increase, and hence, the size of the atom decreases. Thus, C will be smaller in size than B.
(d)- A belongs to group 17. This means that it has 7 valance electrons and it needs one electron to complete its octet. So, A will complete its octet by gaining an electron. Thus, A will form a univalent anion.
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