Chapter 11, Problem 77A

Interpretation Introduction

Interpretation:

A periodic table is to be sketched for given conditions.

Concept introduction:

Periodic table is arrangement of elements in increasing order of atomic number in which elements with same properties lie in a group.

Answer to Problem 77A

  

Explanation of Solution

It is given that periodic table contains 26 element which are represented by alphabets.

The alphabets are to arranged in increasing order. The similarities of elements are given as:

A, C, G, K, Q, Y

B, F, J, P, X

V is its own family

From the above table, it is clear that properties of A, C, G, K, Q and Y are similar as they belong to same family or group. Similarly, properties of B, F, J, P and X are similar.

There is no other element in family where V is present thus, V is its own family.

This can also be interpreted from the structure that 1^st period has two elements A and B, 2^nd period has four elements C, D, E and F, 3^rd period has four elements G, H, I and J, 4^th period has six elements K, L, M, N, O and P, 5^th period has eight elements Q, R, S, T, U, V, W and X and 6^th period has two elements Y and Z

So, the periodic table contains 6 periods and 8 groups.

Conclusion

So, the periodic table contains 6 periods and 8 groups.