The Periodic Table: An Overview Review

The periodic law states that

• 1. The periodic table arranges elements into periods and groups.

• 1. The properties of elements recur periodically when arranged by increasing atomic number.

• 1. The properties of elements recur periodically when arranged by increasing atomic mass.

• 1. The properties of elements recur periodically based on their metallic qualities.

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1. When atoms react, they often lose, gain, or share electrons to form a more stable version of themselves. For example, alkali metals such as potassium lose their outer shell electron in their reactions to form compounds. The electron configuration of alkali metals would then (after losing their outer shell electron) ​ resemble those of group ​ (a)   of the periodic table in the compounds they form.  

• 1A
• 2A
• 3A
• 8A
• 4A
• 5A
• 6A
• 7A

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In the periodic table hydrogen is placed and Group 1A and helium is placed in Group 8A. The best reason for this is that hydrogen

(a)   and helium ​ (b)   .

• has one outer shell electron
• has a full outer shell of electrons
• is a metal
• is a liquid
• is a nonmetal

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1. The metallic character of elements (a)   across a period. Metals are good conductors of ​ (b)   .

• decreases
• heat
• increases
• remains the same
• metalloids
• luster

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1. An early arrangement of the then known elements was proposed by a British scientist John Newlands, which he called the Law of Octaves. Like other scientists at the time, Newlands arranged the elements in order of increasing atomic mass and noted that every eighth element had similar physical/chemical properties. 

In the modern Periodic Table, which of the following represents the last pair of elements for which Newlands’ Law of Octaves would hold true?

• 1. Al and Ga

• 1. Al and Si

• 1. Ne and Ar

• 1. Mg and Ca

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