Periodic Trends

Atomic RadiusAtomic Radius (size) is the distance between the nucleus and the outer electrons in an atom.

Atomic RadiusDecreases left to right,Increases top to bottom

Large

Small

Atomic Radius - Ordering

1) Put the following elements in order of increasing atomic radius:

Ca, Ge, Ni, BrA) Ca < Ge < Ni < BrB) Br < Ge < Ni < CaC) Ca < Ni < Ge < Br

Atomic Radius - Ordering

2) Put the following elements in order of decreasing atomic radius:

Si, Pb, C, GeA) Si > Pb > C > GeB) C > Si > Ge > PbC) Pb > Ge > Si > C

ElectronegativityElectronegativity is the

ability of an atom to attract electrons for bonding.

ElectronegativityIncreasing left to right,

Increasing bottom to top,noble gasses excluded

Low

High

Electronegativity- Ordering

3) Put the following elements in order of increasing electronegativity:

Br, Cl, F, AtA) At < Br < Cl < FB) F < Cl < Br < AtC) Br < Cl < F < At

Electronegativity- Ordering

4) Put the following elements in order of decreasing electronegativity:

Zr, Sn, I, RbA) Rb > Zr > Sn > IB) Zr > Sn > I > RbC) I > Sn > Zr > Rb

Ionization EnergyThe energy needed to

remove an electron from an atom’s valence shell is ionization energy.

Ionization EnergyIncreasing left to right,

Increasing bottom to top

Low

High

Ionization Energy - Ordering

5) Put the following elements in order of increasing ionization energy :

Ni, C, Zr, BaA) Ni < C < Zr < BaB) Ba < Zr < Ni < CC) C < Ni < Zr < Ba

Ionization Energy - Ordering

6) Put the following elements in order of decreasing ionization energy:

Cr, Ca, Ne, PA) Ne > P > Cr > CaB) Ca > Cr > P > NeC) P > Ne > Ca > Cr