Periodic Table 1
The electrons involved in chemical reactions are these.
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 and families?
These are shiny, good conductors, solids at room temperature, shiny, ductile, and malleable
What are the properties of metals?
An atom with a completely full outer most (valence) energy level is this.
What is unreactive?
These elements have characteristics of both metals AND nonmetals
What are metalloids?
The columns on a periodic table are called this.
What are groups?
These are the properties of metalloids.
What are many properties of both metals and nonmetals?
Group 17, period 4
What is Bromine?
Mendeleev organized the elements of his periodic table according to this.
What is increasing atomic mass?
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?
Elements in the same group share this.
What are the same number of valence electrons
These are the properties of nonmetals.
What are brittleness, low boiling/melting points, dull, and are good insulators?
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 classes of elements are these.
What are metals, metalloids, and nonmetals?
An unknown metal is extremely soft, silvery grey and very reactive when floated on water. It is likely that the unknown metal belongs to this group of elements.
What is group 1 or alkali metals?
The modern periodic table is organized according to this.
What are 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 class 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?