Historical
This is the most reactive group of metals.
What are alkali metals
Mendeleev used observation about chemical and physical properties to organize the first periodic table based on __________.
What is atomic mass
These are typically shiny, good conductors of electricity, and are malleable.
What are metals
This elemental family occupies the middle of the periodic table and is known for having unpredictable numbers of valence electrons.
What are transition metals
The periodic table is arranged so that certain groups have predictable patterns of ______________.
What is valence electrons.
What is anion.
this elemental family can easily combine with many other atoms. having seven valence electrons, this group will form bonds with almost any other atom.
What are halogens?
This scientist discovered that the Periodic Table should instead be based on the number of protons, or atomic number.
Who is Henry Moseley
What are isotopes.
can display metallic and non-metallic properties based upon certain conditions
What are metalloids
this group is completely nonreactive due to having 8 valence electrons.
What are the noble gases.
Ernest Rutherford announced the existence of the __________, Moseley's fundamental unit.
What is proton.
If an atom gains electrons, what type of charge does it have?
What is negative.
How many groups are on the Periodic Table?
What is 18.