Periodic Table Concepts and Definitions

What does 'Atomic mass' refer to?

• The number of protons plus the number of neutrons in the nucleus of an atom

• The number of protons in the nucleus of an atom

• A chart that organizes information about elements

• Elements that have some properties of both metals and nonmetals.

The 'Periodic table' is: A) A chart that organizes information about all of the known elements according to their properties B) The number of protons in the nucleus of an atom C) Horizontal row in the periodic table D) Vertical column in the periodic table.

• A) A chart that organizes information about all of the known elements according to their properties

• B) The number of protons in the nucleus of an atom

• C) Horizontal row in the periodic table

• D) Vertical column in the periodic table

Fill in the blank: 'Atomic number' is the number of ______ in the nucleus of an atom.

• Neutrons

• Electrons

• Protons

• Valence electrons

What is a 'Period' in the periodic table?

• Vertical column

• Horizontal row

• A chart that organizes information

• The number of protons

Fill in the blank: A 'Group' is a ______ in the periodic table; also called a chemical family.

• Horizontal row

• Vertical column

• Chart

• Element

'Valence electrons' are: A) Electrons located in the outermost energy level of an atom B) The number of protons in the nucleus of an atom C) A chart that organizes information about elements D) Elements that have some properties of both metals and nonmetals.

• Electrons located in the outermost energy level of an atom

• The number of protons in the nucleus of an atom

• A chart that organizes information about elements

• Elements that have some properties of both metals and nonmetals.

Fill in the blank: 'Reactivity' describes how likely an element is to ______ with other elements.

• Form bonds

• Lose electrons

• Gain protons

• Become inert

What is a 'Metalloid'?

• A) Elements that have some properties of both metals and nonmetals

• B) A chart that organizes information about elements

• C) The number of protons in the nucleus of an atom

• D) Unable to react chemically under normal circumstances.

Fill in the blank: 'Inert' means unable to ______ under normal circumstances.

• React chemically

• Form bonds

• Gain electrons

• Lose protons