Periodic trends - Cloudfront.net
Download
Report
Transcript Periodic trends - Cloudfront.net
st
1
Ionization Energy
The amount of energy required to remove an electron
from an atom.
Trend:
Increases left to right across a row.
Increases bottom to top of a column.
Ex: Which of the following elements has the highest 1st
ionization energy? Na, Al, Cl, or Mg?
Ex: Which of the following elements has the highest 1st
ionization energy? K, Rb, H, or Li?
Electronegativity
The force with which a nucleus is attracted to its
electrons
How strongly an atom holds on to its electrons
Trend
Increases left to right across a row
Increases bottom to top of a column.
Ex: Which of the following elements has the highest
electronegativity? Na, Al, Cl, or Mg?
Ex: Which of the following elements has the highest
electronegativity? K, Rb, H, or Li?
Atomic and ionic radius
The size of an atom or ion (we’ll talk about ions later)
Trend
Increases right to left of a row
Increases top to bottom of a column.
Ex: Which of the following elements has the largest
atomic radius? Na, Al, Cl, or Mg?
Ex: Which of the following elements has the largest
atomic radius? K, Rb, H, or Li?
Practice
What is the name of column 1 on the periodic table?
What is the name of column 17 on the periodic table?
How many valence electrons do the noble gases have?
Draw the lewis dot diagram for arsenic.