The melting point, boiling point and density of technetium should be determined from the averages of the properties of neighbouring elements in the periodic table and predictions should be compared with the observed values in Appendix F. Concept introduction: Periodic Table contains periods and groups. There are 18 groups and 7 periods in the periodic table. The vertical columns are known as groups and horizontal rows are known as periods. The numbering of periods is done as 1 to 7 from top to bottom and groups are named as 1A, 2A, 3B to 8B, 1B, 2B, 3A to 8A from left to right where A represents representative elements and B represents transition elements.Elements in the same family have similar chemical and physical properties. In periodic table, elements are classified as metals, non-metals or metalloids.

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Chapter 3, Problem 2P

Interpretation Introduction

Interpretation:

The melting point, boiling point and density of technetium should be determined from the averages of the properties of neighbouring elements in the periodic table and predictions should be compared with the observed values in Appendix F.

Concept introduction:

Periodic Table contains periods and groups. There are 18 groups and 7 periods in the periodic table. The vertical columns are known as groups and horizontal rows are known as periods.

The numbering of periods is done as 1 to 7 from top to bottom and groups are named as 1A, 2A, 3B to 8B, 1B, 2B, 3A to 8A from left to right where A represents representative elements and B represents transition elements.Elements in the same family have similar chemical and physical properties. In periodic table, elements are classified as metals, non-metals or metalloids.

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