Periodic Trends
What periodic trend does atomic radius follow?
Decreases across, increases down
the fixed energies an electron can have
Energy Levels
Electron Configuration of Krypton
1s22s22p63s23p63d104s24p2
Where are the representative elements?
Groups 1A through 7A
where are noble gases located?
Group 18/ last row on the right
What periodic trend does ionization energy follow?
Increases across, decreases down
electrons occupy the orbitals of lowest energy first
Aufbau Principle
Electron Configuration of Potassium
1s22s22p63s23p64s1
What kind of metal is Sulfur?
Nonmetal
shape of p orbital
dumbell
Which element has a larger atomic radius: Na or Fr
Francium
is one half of the distance between the nuclei of two atoms of the same element when atoms are joined
Atomic Radius
Electron Configuration of Neon
1s22s22p6
What kind of metal is Calcium?
Alkaline metal
Shape of s orbital
sphere
Which element has a smaller electronegativity: Li or O
Lithium
Cation
ion with positive charge
Electron Configuration of Argon
1s22s22p63s23p6
Where are the Alkali metals?
Group 1A except for Hydrogen.
What charge do anions have and why?
- negative charge because they gain an electron
Which element has a greater ionization energy: Ba or Se
Barium
Anion
ion with a negative charge
Electron Configuration of Lithium
1s22s1
What contains properties that are similar to those of metals and nonmetals and the behavior often can be controlled by the changing conditions?
Metalliods
What charge do cations have and why?
- positive charge because they lose an electron