Chem. Ch. 6 Review

What did Dobereiner contribute to the periodic table?

• Developed a triad

• Developed a tetrad

• Developed a pentad

What is an example of a triad?

• A) Lithium (Li), Sodium (Na), Potassium (K)

• B) Carbon (C), Nitrogen (N), Oxygen (O)

• C) Iron (Fe), Copper (Cu), Zinc (Zn)

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What is a triad?

• A group of 3 elements with similar properties.

• A pair of elements with opposite properties.

• A single element with unique properties.

• A group of 4 elements with similar properties.

What did Newland contribute to the periodic table?

• He said that every 8th element properties are repeated.

• He discovered the noble gases.

• He arranged elements by increasing atomic number.

• He introduced the concept of atomic weights.

What is the rule of octaves?

• The law of octaves states that the chemical elements are arranged based on increasing atomic weights as well as similar chemical and physical properties.

• The rule of octaves is a musical theory that describes the relationship between different musical notes.

• The rule of octaves is a mathematical principle used in number theory to solve complex equations.

• The rule of octaves is a guideline for arranging musical compositions in a specific order.

What is the octet rule?

• An atom is most stable when the outer shell contains a full 8 electrons.

• An atom is most stable when it has 6 electrons in its outer shell.

• An atom is most stable when it has 10 electrons in its outer shell.

• An atom is most stable when it has 4 electrons in its outer shell.

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What did Mendeleev use to organize his periodic table? What change did Mosley make?

• Elements in order of increasing atomic mass. Mosley arranged the periodic table in order of increasing atomic number.

• Elements in alphabetical order. Mosley arranged them by color.

• Elements in order of discovery date. Mosley arranged them by density.

• Elements grouped by their state of matter. Mosley arranged them by melting point.

Explain what Mendeleev did by leaving a gap in his periodic table?

• To account for unknown elements and their associated properties.

• To make the table look symmetrical.

• To separate metals from non-metals.

• To indicate elements that were not discovered yet.

State the periodic law.

• When elements are ordered by atomic number there is a periodic pattern to their chemical and physical properties.

• Elements are arranged in order of increasing atomic mass, showing a periodic pattern in their properties.

• The properties of elements are a periodic function of their atomic weights.

• Elements are arranged in order of increasing density, showing a periodic pattern in their properties.

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Label the different families on the periodic table.

• Alkali metals, alkaline earth metals, transition metals, inner transition (rare earth) metals, metalloids, halogens and noble gases.

• Alkali metals, noble gases, nonmetals, halogens, and actinides.

• Transition metals, noble gases, halogens, lanthanides, and nonmetals.

• Alkaline earth metals, transition metals, noble gases, halogens, and metalloids.