Question

The following table shows the position of five elements A, B, C, D and E in

the modern periodictable.

Answer the following giving reasons:

(i) Which element is a metal with valencytwo?

(ii) Which element is leastreactive?

(iii) Out of D and E which element has a smaller atomicradius?​

Answer 1

Explanation:

1. element D as it's located in group 2 hence it has a valency of 2

2. element C bcz it's located in group 18 that's noble gas

3. C has smaller size bcz it's located in period 2 and thus have less no of orbits

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Answer 2

Answer:

Let us prove that √5 is an irrational number, by using the contradiction method. So, say that √5 is a rational number can be expressed in the form of pq, where q ≠0. So, let √5 equals pq. Where p, q are co-prime integers i.e. they do not have any common factor except '1'.