The position of elements A,B,C,D and E in the periodic table are shown below:

$\begin{matrix} G r o u p 1 & G r o u p 2 & G r o u p 17 & G r o u p 18 - & - & - & D - & B & C & - A & - & - & E \end{matrix}$

(a) State which are metals, non-metals and noble gas in this table.

(b) State which is the most reactive (i) metal (ii) non-metal

(c) Which type of ion will be formed by element A,B,and C.

(d) Which is larger in size (i) D or E (ii) B or C.

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Solution

(a)Metals: A and B; Non-metals: C; Noble gases: D and E

(b)Most reactive is A (metal) and C (nonmetal).

For example

Metals: Alkali metals (Group I); Potassium

Non-metals: Halogens (Group 17); Fluorine

(c)

Element A will form a positive ion 1⁺ (cation).
Element B will form a positive ion 2⁺ (cation).
Element C will form a negative ion 1^– (anion).

(d)

E

B

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Standard X Chemistry

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