Chapter 6, Problem 37A

Interpretation Introduction

Interpretation:

The first of 55 elements that would be ordered differently than they are in the existing table needs to be determined, if the periodic table was arranged by atomic mass

Concept introduction:

The arrangement of elements on the basis of atomic number is the basis of the modern periodic table. There are 18 groups and 7 periods in the periodic table. The periodic table is divided into four blocks, s-block, p-block, d-block and f-block.

Answer to Problem 37A

Three pair of elements orders differently if arranged according to their masses.

Explanation of Solution

The present periodic table is arranged on the basis of atomic number. If the periodic table is arranged on the basis of atomic mass, potassium with atomic mass 39.09 is appeared before argon (39.95), nickel (58.69) would appear before cobalt (58.93) and iodine (126.90) would appear before tellurium (127.6).

Conclusion

If elements are arranged on the basis of atomic mass, potassium-argon, nickel-cobalt and iodine-tellurium arranged differently than the existing periodic table.