Discussing the difference between Atomic Radii & Ionic Size				Fall 2011

1.	 Comparing different atoms to other atoms (ex:  Ca to K)
Follow general rules as stated here 
For neutral atoms = as you go across the row, size decreases b/c more e- = more condensed atom
		= as you go down column, size increases b/c addition of another e- shell

2.	 Comparing a charged ion to its neutral form (ex:  Li to Li+1)
Follow rules and examples stated here
FOR CHARGED ATOMS  / IONS …

=positive ions (cations) are ALWAYS SMALLER  than their neutral component
=negative ions (anions) are ALWAYS LARGER  than their neutral component

SO …   Li larger than Li+		O-2 larger than O-1	Al larger than Al+3	Zr+2 larger than Zr+3

3.	Comparing different ions to different ions (ex:  Cl-1 to Mg+2)
*compared ions of DIFFERENT ATOMS, look at what they are pretending to be and then compare …  Cl- (pretending to be Ar) larger than Mg+2 (pretending to be Ne)
---Cl-1 is larger than Mg+2 because it has 1 more shell

ATOMIC RADII:
-as you move across the row (staying on same shell) size decreases b/c adding more electrons causing the atom to condense to a smaller size

-as you move down the column, size INCREASES b/c you are adding more shells (going to a higher numbered row)

Discussing the difference between Atomic Radii & Ionic Size				Fall 2011

1.	 Comparing different atoms to other atoms (ex:  Ca to K)
Follow general rules as stated here 
For neutral atoms = as you go across the row, size decreases b/c more e- = more condensed atom
		= as you go down column, size increases b/c addition of another e- shell

2.	 Comparing a charged ion to its neutral form (ex:  Li to Li+1)
Follow rules and examples stated here
FOR CHARGED ATOMS  / IONS …

=positive ions (cations) are ALWAYS SMALLER  than their neutral component
=negative ions (anions) are ALWAYS LARGER  than their neutral component

SO …   Li larger than Li+		O-2 larger than O-1	Al larger than Al+3	Zr+2 larger than Zr+3

3.	Comparing different ions to different ions (ex:  Cl-1 to Mg+2)
*compared ions of DIFFERENT ATOMS, look at what they are pretending to be and then compare …  Cl- (pretending to be Ar) larger than Mg+2 (pretending to be Ne)
---Cl-1 is larger than Mg+2 because it has 1 more shell

ATOMIC RADII:
-as you move across the row (staying on same shell) size decreases b/c adding more electrons causing the atom to condense to a smaller size

-as you move down the column, size INCREASES b/c you are adding more shells (going to a higher numbered row)