Periodic Table 1
The electrons involved in chemical reactions that are found in the outermost energy level.
What are valence electrons?
Group 13, Period 4
What is Gallium?
The atomic number tells you this.
What is the number of protons (and electrons) an atom of an element should have?
Group 16, Period 2
What is Oxygen?
The columns on the periodic table
What are groups/families?
These are shiny, good conductors, solids at room temperature, shiny, ductile, and malleable
What are metals?
An atom with a completely full outermost (valence) shell is this, such as those atoms from the noble gases chemical family, has this property.
What is unreactive?
This element is very radioactive and has an atomic number of 92.
What is Uranium?
The columns on a periodic table are called this.
What are groups?
These types of elements have properties/characteristics of both metals and nonmetals.
What are metalloids?
Group 17, Period 4
What is Bromine?
These makeup the staircase in the periodic table.
Group 17 contains highly reactive nonmetals with seven valence electrons that tend to react violently with alkali metals and are more commonly known as this.
What are halogens?
Elements in groups 3-12 are called this
What are transition metals?
Each element on the periodic table has this listed below it's chemical symbol and name.
What is the average atomic mass?
The have brittleness, low boiling/melting points, dull, and are good insulators.
What are nonmetals?
Group 18 elements are extremely nonreactive nonmetals known as this.
What are noble gases?
Extremely reactive elements in group 1 have only 1 valence electron and are known as this.
What are alkali metals?
The rows on a periodic table are known as this.
What are periods?
The three classifications of elements.
What are metals, metalloids, and nonmetals?
An unknown metal is extremely soft, silvery grey, very reactive when floated on water and have only 1 valence electron.
What is group 1 or alkali metals?
The modern periodic table is organized according to this.
What is by increasing atomic number?
The rows on the periodic table
What are periods?
The Actinides and Lathanides are two subgroups of radioactive elements that belong to this classification of elements.
What are metals?
Reactive elements in group 2 have only 2 valence electrons and are known as this.
What are alkaline Earth metals?