ERHS Chem CK-12 Chapter 5 - Periodic Table

The Modern Periodic Table of Elements is arranged by increasing

• atomic mass

• atomic number

• valence electrons

• number of isotopes

What are valence electrons?

• The total number of an atom's electrons.

• Electrons located on the first energy level.

• Electrons not attached to any atom.

• Electrons located in the highest energy level.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What category of elements is silicon (Si) a part of?

• Metals

• Nonmetals

• Metalloids

• Halogens

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Scientists in the future will create new elements that will exist in Period 8 of the Periodic Table that does not currently exist. If a new element was created in Period 8 and Group 1, which properties will it have? (Check ALL Correct Answers)

• it will have one of the smallest electronegativity values on the Periodic Table

• It will gain electrons when it forms an ion.

• It will be classified as a nonmetal

• It will have one of the smallest ionization energies on the Periodic Table

• It will have one of the smallest atomic radii of elements on the Periodic Table

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What is the name of the group that contains the most reactive metals?

• Noble gases

• Halogens

• Alkali metals

• Alkaline earth metals

How many valence electrons does an atom of carbon have?

• 8

• 4

• 2

• 6

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Each column in the periodic table is called a:

• period

• group

• cluster

• unit

Which group of the periodic table is composed of inert (not reactive) gases?

• alkali metals

• alkaline earth metals

• halogens

• noble gases

Which element has two valence electrons that are located in its second energy level?

• Beryllium (Be)

• Lithium (Li)

• Zinc (Zn)

• Magnesium (Mg)

Tags

NGSS.HS-PS1-1

What is the name of the group that contains the most reactive nonmetals?

• Noble gases

• Halogens

• Alkali metals

• Alkaline earth metals