History and Periodic Law
There are 7 periods in the period table equal to the number of _________
Energy Levels
What are the three major categories of elements?
Metals, Nonmetals, and Metalloids
The Atomic Radius is _______ the distance between two adjacent atoms.
Half
Electronegativity
The number of ______ determines the reactivity of elements
Valence Electrons
What is Group 1 of the period table called?
Alkali Metals
What is it called when inner shell electrons block the attraction between the nucleus and valence electrons.
Electron Shielding
What is ionization energy?
Energy required to remove an electron from the electron cloud
What is the repeating pattern in which the properties repeated every eighth element called?
Law of Octaves
Transition Metals form ________ in solutions.
Colored Ions
As you go down a group and the energy levels increase, the ______ between the nucleus and valence electrons increases and thus ______ the attraction.
1. Distance
2. Weakens/Decreases
As you go across a period and the number of protons increase, the _______ increases and thus _______ the attraction.
1. Nuclear Charge
2. Strengthens/Increases
What do you call when you have only two electrons to complete an energy level?
A Stable Duet
Metalloids have _____ (like metals) but are also ______ (like nonmetals)
1. Luster
2. Brittle
Why is electron shielding only a factor in group trends and not in period trends?
All the elements in the same period have the same amount of energy levels
Electronegativity ______ as you go across a period and ______ as you go down a group.
1. Increases
2. Decreases
Ekasilicon, Mendeleev's element, was discovered to be what actual element based on predicted properties?
Germanium
What metal is not solid at STP?
Mercury (Hg)
Rank the atomic radius, ionization energy, and electronegativity between Fluorine (F) and Potassium (K).
1. Atomic Radius: K > F
2. Ionization Energy: F > K
3. Electronegativity: F > K
How are ionization energy and atomic radius correlated (directly or inversely) and why?
Inversely
Ionization energy increases across a period and decreases as you go down a group while
Atomic radius decreases across a period and increases as you go down a group