Periodic Trends 4 Flashcards
(23 cards)
Actinides and lanthanides fit into the table right after group
2A
Lanthanides and actinides are often shown below main table because
The table would be too long to fit on the page
Actinide elements range from
89
103
Actinide elements are mostly _ elements
Man-made
Actinide elements don’t exist in
Nature
Only two actinide elements that exist in nature (2)
Uranium
Plutonium
Lanthanides are called
Rare-earth metals
Lanthanide elements range from
57
71
Lanthanide elements have properties that are similar to
Lanthanide
When you look at the periodic table, you can see
Trends
The trends in the periodic table explain
The properties of each element
The properties to be aware of include (ar,ir)
Atomic radius
Ionic radius
The properties to be aware of include (ie,re)
Ionization energy
Reactivity electronegativity
The properties to be aware of include
Valence electrons
It is important to understand how the _ affect the electrons in the outer shell
Protons in the nucleus
How protons in nucleus affect electrons in outer shell is called
Effective nuclear charge
Effective nuclear charge is the net or total positive charge felt by
An electron in an atom with multiple electrons
In an atom with more than one electron, the positive charge from protons is
Distributed among the electrons
Positive charge distributed among electrons so that
Full positive pull is not felt by any one electron
In atoms with multiple levels of electrons
Valence electrons are shielded from full force of pull from protons by lower levels of electrons
Shielding effect is the balance between positive force from protons on valence electrons and
Repulsion from inner electrons
_ is the measure of the size of the atoms
Atomic radius
Atomic radius is typically the distance from the center of nucleus to
Outermost electron
