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Using this information, complete the following: a) Identify the characteristic common to the elements discovered before 1750. b) Determine during which period the most elements were discovered. c) Explain how Mendeléev’s work contributed to the discovery of many elements. Number of elements 25 24 25 20 20 15 15 14 14 1901– 1950 1951– present 10 5 Quit 24. The element with atomic number 119 has not yet been isolated. You are a member on the team who has just achieved that goal. Suggest to which group it would belong.
Record your observations. 7. Test each of the beakers with a piece of red litmus paper and a piece of blue litmus paper. Note any colour changes. Tabulate your results in the following table: UNIT 1 Matter and Chemical Bonding Order of Reactivity 1 (most) → 5 (least) aluminum 1. 8. 28 Conducting and Recording ̈ sodium magnesium Procedure Using Tools, Materials, and Equipment ̈ lithium Materials CHEMICAL DISPOSAL: Make sure all the metal has reacted and rinse out all solutions with water. Place any leftover solids in a designated waste container.
A very common example of a covalent molecule is water, H2O. Because oxygen is in group 16, it requires 2 more electrons to form an octet, 1 from each hydrogen atom. The 2 electrons shared between each oxygen atom and hydrogen atom are called bonding pairs. Since there is only 1 pair of electrons involved in each bond, it is said to be a single bond. The 2 pairs of electrons on the central oxygen atom that are not involved in bonding are called lone pairs. 14 If only 1 atom of an element is present in a chemical formula, whether it is covalent or ionic, no subscript is used after the symbol of that element.