Periodic Table and Atomic Structure Quiz

What is the modern periodic table based on?

• Mass number of elements

• Number of neutrons

• Atomic number and properties

• Melting point

What are valence electrons?

• Electrons in the nucleus

• Electrons in the outermost shell

• Electrons used in bonding only

• Electrons that carry current

What is ionization energy?

• Energy to break a nucleus

• Energy needed to remove an electron from an atom

• Energy given off when two atoms bond

• Energy needed to add neutrons

Why does ionization energy increase across a period?

• Atomic number decreases

• Shielding increases

• Attraction between nucleus and electrons increases

• Electrons move to inner shells

What is shielding in an atom?

• When electrons block sunlight

• Core electrons block valence electrons from full attraction of the nucleus

• Valence electrons attract protons

• Electrons moving to another atom