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Oct 45:28 AM
Periodic Trends
objectives:
Atomic Radius
Reactivity
Ionization Energy
1. I can label the parts of the periodic table, including: metals/nonmetals/
metalloids, families/groups, and valence electron trend by group.
2. I can use the periodic table to predict trends of given properties.
3. I can explain the electron trends for metals and nonmetals.
4. I can compare elements’ electron attraction to their nuclei in regard to
nuclear charge and e distance by applying Coulomb’s Law.
5. I can the use periodic table to predict the trends for atomic radius and
ionization energy to estimate an element’s reactivity.
Oct 151:31 PM Coulomb's Law Charge: The greater the charges are, the stronger the force of attraction
F = Force
q = charge of a particle, need + and to attract
r = radius (distance)
k = constant
2 variables: distance and charges Distance: basis stability of atoms and ions and periodic trends
Oct 52:36 PM Metal reactivity analogy Fr e e e e e e e e e e e e e e e e (^) e e e^ e e e e e e e e e e e e e Li e e e e e^ e e e e e e e e e e e e e e e e boy girl this e is close to the nucleus and has a stronger attraction *Proximity (distant e more reactive) girl boy
Oct 52:36 PM Metal reactivity analogy Fr e e e e e e e e e e e e e e e e (^) e e e^ e e e e e e e e e e e e e Li e e e e e^ e e e e e e e e e e e e e e e e boy girl this e is close to the nucleus and has a stronger attraction and no "distractions" boy girl *Shielding (decrease effective nuclear charge) *Proximity (distant e more reactive) distractions
Oct 52:36 PM Reactivity of Nonmetals Therefore, the closer the e is, the easier it is to gain and the more reactive it is. Nonmetals gain e. noble gases are not reactive F I e e more reactive more reactive easier (less energy) to gain 1 e on F Coulomb's Law Distance and Charge less distance and more charge F (Halogen) is more reactive than O e is attracted to F nucleus O F #8 # 8p+^ 9p
8e e e (^) e e e e 9e e (^) e e e^ e e e e e e e noble gases are not reactive more reactive
Oct 49:12 PM
noble gases
are not
reactive
most reactive nonmetal most reactive metal Reactivity
Oct 1510:40 AM
- Metals tend to (gain/lose?) electrons
- Nonmetals tend to (gain/lose?) electrons
- Which atom has the bigger radius? Why? a. Mg (#12) or Cl (#17) b. Mg(#12) or Ra (#88)
- Which atom is more reactive? Why? a. K(#19) or Ca (20) b. Mg(#12) or Ra (#88) c. Cl (#17) or F(#9)
- Which atom has the smaller ionization energy? Why? a. K(#19) or Ca (20) b. Mg (#12) or Cl (#17) c. Mg(#12) or Ra (#88)
Nov 412:13 PM Radii (^) Reactivity Ionization Energy Periodic Trends: biggest atoms here smallest atoms here
