Classification of the Elements Practice Problems

What is a valence electron?

• An electron in an atom's innermost shell

• An electron in an atom's outermost energy level; determines the chemical properties of an atom

• A proton in the nucleus of an atom

• A neutron in the nucleus of an atom

What does the term "structure" refer to in an academic context?

• A random collection of elements

• A single, isolated element

• Something made up of more-or-less interdependent elements or parts

• A chemical reaction

Electrons in the highest principal energy level of an atom are known as what?

• Valence electrons

• Core electrons

• Protons

• Neutrons

What do atoms in the same group have in common?

• The same number of valence electrons

• The same atomic mass

• The same number of protons

• The same atomic radius

What does the energy level of an element's valence electrons indicate?

• The period on the periodic table in which it is found

• The group number of the element

• The atomic mass of the element

• The number of neutrons in the nucleus

Elements with valence electrons in energy level 2 are found in which period?

• The second period

• The third period

• The fourth period

• The fifth period

How many valence electrons do all elements in group 1 have?

• One valence electron

• Two valence electrons

• Three valence electrons

• Four valence electrons

Helium, in group 18, is an exception to what rule?

• Having eight valence electrons

• Being a metal

• Having a high atomic mass

• Being a liquid at room temperature

Why do atoms in the same group have similar chemical properties?

• They have the same number of valence electrons

• They have the same atomic mass

• They have the same number of protons

• They have the same atomic radius

Which periodic table groups are included in the s-block?

• 1 and 2

• 13 through 18

• 3 through 12

• Lanthanide and actinide series