Periodic families
The elements Ce, Gd, and Ho are part of this family
Rare earth metals
All elements in this family have 5 valence electrons
Nitrogen family
today's Periodic Table is organized by this number (number of protons)
Atomic number
Which element is found in seafood and necessary for thyroid function?
iodine
Which elements on the Periodic Table are manmade?
All After 92
This family contains a common metalloid called Silicon
Carbon family
This family contains an element that makes up a large portion of our bones.
Alkaline earth metals
The Russian scientist who organized the first periodic table with the elements known at the time
Mendeleev
Comparing Be, Ca, Mg, and Ba which element reacts most violently with water?
Ba
Which element is mostly used for making packaging?
Aluminum (Al)
The elements in this family all have 3 valence electrons
Boron Family
The elements in this family become more reactive as you move down the group.
Alkali metals
Lavoisier
Which element is critical for photosynthesis in plants?
Magnesium (Mg)
valence electrons
The element with atomic mass 19 is a member of this family
Halogens
Iron (Fe) is a member of this family
Transition metals
metals, nonmetals, gases, earths
Comparing elements Mn, O, Li, and Al which one is a nonmetal?
Oxygen (O)
elements in the same ______ have the same energy level for outer electrons
period
This family is the least reactive on the Periodic Table
Noble Gases
This family contains the element Rb
Alkali metals
These 2 properties are how Mendeleev organized his periodic table
mass and physical properties
Which element is used to make computer parts because of its metalloid properties?
Silicon (Si)
elements in the same _____ generally have the same number of valence electrons
group