Unit 4: Periodicity
Nobel gases have _ valence electrons?
8
Explain the concept of "shielding"
A barrier made of inner-shell electrons which serves to decrease the pull of the nucleus on the outer electrons
What would cause an electron cloud to get bigger?
Adding more electrons
Name of group 1?
Alkali metals
Name of group 2?
Alkaline (earth) metals
Atomic radius increase by ?
Arrow going down group and and arrow pointing to the left
Electronegativity increase by ?
Arrow pointing up, and arrow going right
ionization energy increase by ?
Arrow pointing up, and arrow going right
Name of group 13?
Boron group (may not be right)
How did Moseley arrange his periodic table?
By atomic #
How did Mendeleev arrange his periodic table? Why were there empty spaces in his table?
By atomic mass, & he predicted properties of unknown elements
Name of group 14?
Carbon group (may not be right)
Name of group 16?
Chalogens
family/ group
Column, 1-18
Atomic radius
Distance from the nucleus of an atom to the outermost electron
Who is responsible for arranging the very first periodic table?
Dmitri Mendeleev
valence electrons
Electrons on the outermost energy level of an atom, s & p
True or false: when a metal becomes an ion, it gets larger
False
An anion ____ electrons and a cation ___ electrons
Gains, loses
What group on the periodic table is the least reactive?
Group 18
Name of group 17?
Halogens
Why does adding more protons tend to decrease atomic radius?
Increases the nuclear pull (may be wrong)
Name of the "f-block"
Inner-transition metals
An anion is ____ than it's neutral atom while a cation is ___
Larger, smaller
Metals are located one the __?__ side of the periodic table
Left
Elements bordering the zigzag line in the periodic table are ________
Metalloids
Name of group 18?
Nobel gases
Name of group 15?
Pnictogens
What do the elements in the same group have in common?
Properties
Ionic radius
Radius of an atoms ion
Non-metals are located on the ___?__ side of the periodic table
Right
Period
Rows, 1-7
What sub-levels can exist in energy level 3?
S, P, D
What do we call electrons on the inner levels?
Shielding electrons
What do elements in the same period have in common?
They all have valence electrons in the same energy level
Name of group 3-12?
Transition metals
Periodicity
Trends or reccuring varitations in the elements properties with increasing atomic number
True or false: according to the atomic radius trend, Francium has the largest atomic radius on the periodic table
True
When a nonmetal becomes an ion, it gets larger
True
periodic law
When elements are arranged in order of increasing atomic number, their properties occur at regular intervals
How do you determine the number of valence electrons
You add s & p electrons
ionization energy
energy required to remove an electron from an atom
