opposites attract like charges repel more charge the greater the force. the more distance the weaker...
TRANSCRIPT
PERIODIC TRENDS
• Nuclear Charge• Electron Shielding• Atomic Size• 1st Ionization Energy• Electronegativity• Reactivity
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F = KQ1Q2r2
Coulomb’s Law
Opposites AttractLike Charges Repel
More Charge the greater the force.The more distance the weaker the force
Nuclear Charge
Nuclear Charge Increases
Nuc
lear
Cha
rge
Incr
ease
s
Total electric charge in a nucleus. It is equal to the number of protons.
The Nucleus is what attracts electrons and keeps them in the atom.
1
HHydrogen
1
3
LiLithium
7
11
NaSodium
23
1s22s22p63s1
1s22s1
1s1
As you go down a group or column in the periodic table the number of energy levels increases.
Pattern?
1
HHydrogen
1
3
LiLithium
7
11
NaSodium
23
1s22s22p63s1
1s22s1
1s1
As you go down a group or column in the periodic table the number of energy levels increases.
5
BBoron
11
3
LiLithium
7
4
BeBeryllium
9
As you go across a period the number of energy levels remains constant.
Pattern?
Electron Shielding
--
-- -
-
-
-
-
- -+11Electrons in an atom can shield each other from the pull of the nucleus.
As you go across a period electron
shielding is constant.
As you go down a group electron
shielding increases.