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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Principles of Modern Chemistry
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- The average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring boron consists of two isotopes with accurately known masses (10B, 10.0129 amu and 11B, 11.0931 amu).The actual atomic mass of boron can vary from 10.807 to 10.819, depending on whether the mineral source is from Turkey or the United States. Calculate the percent abundances leading to the two values of the average atomicmasses of boron from these two countries.arrow_forwardDifferentiate between metal and non-metal on the basis of their chemical properties.arrow_forward16. In the periodic table, the element hydrogen is sometimes grouped with the alkali metals and sometimes with the halogens. Explain why hydrogen can resemble the Group 1A and the Group 7A elements.arrow_forward
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