Download 2.2 Periodic Trends

Section: 2.2
Date:
Essential
Questions
Periodic Trends
Atomic Radius
Periodic Trends

What are the trends that occur in the periodic table by organizing elements by
their atomic number?
 Periodic trends are specific patterns that are present in the periodic table that
illustrate different aspects of a certain element.
 Periodic trends, arising from the arrangement of the periodic table, provide
chemists with a tool to quickly predict an element’s properties.
 These trends exist because of the similar atomic structure of the elements within
their group families or periods, and because of the periodic nature of the elements.
 The atomic radius is one-half the distance between the nuclei of two atoms.
Which has a
greater atomic
radius: Al or Ca?
Electronegativity

Which is greater:
Sc or Ni?

Electronegativity is a chemical property describing an atom’s ability to attract
and bind with electrons.
It measures an atom’s tendency to attract and form bonds with electrons.
First Ionization
Energy

Ionization energy is the energy required to remove an electron from a neutral
atom in its gaseous phase.

Electron affinity is the ability of an atom to accept an electron.
Which is greater: Ge
or I?
Electron Affinity
Which is greater: H
or Zn?
Reactivity
Which is greater:
Zn or Au?
Br or O?
 Reactivity refers to how likely an atom is to react with other substance.
 Metals and Nonmetal have different trends.