Vocabulary
This is the number of protons in an atom.
What is atomic number?
This scientist first recognized patterns in the elements based on their properties
Who is Dmitri Mendeleev?
Metals are good conductors of these two things.
What are heat and electricity?
Nonmetals are (good/poor) conductors of electricity.
What are poor conductors?
These elements have properties of both metals and nonmetals.
What are metalloids?
This is the average mass of an element’s isotopes.
What is atomic mass?
This scientist reorganized the table by atomic number.
Who is Henry Moseley?
This property means metals are shiny.
What is luster?
Most nonmetals are in this state of matter at room temperature.
What are gases?
The most common metalloid used in electronics.
What is silicon?
This describes how easily an element reacts with others.
What is reactivity?
Horizontal rows on the periodic table are called this.
What are periods?
These metals are in Group 1 and are VERY reactive.
What are alkali metals?
These elements are very reactive nonmetals in Group 17. Also known as "salt formers"
What are halogens?
Metalloids are used as these in electronics.
What are semiconductors?
This is the ability of a metal to be pulled or drawn into a wire.
What is ductility?
Vertical columns on the periodic table are called this.
What are groups?
This metal property allows metals to be hammered into sheets.
What is malleability?
These elements are unreactive and found in Group 18.
What are noble gases?
The sun is mostly made of this element.
What is hydrogen?
This is a hot gas made of charged particles found in stars.
What is plasma?
Mendeleev left blank spaces for these
What are undiscovered elements?
What are elements he predicted to be discovered?
These metals are found in the center of the periodic table.
What are transition metals?
Nonmetals are usually dull and this (opposite of malleable) This word also means fragile.
What is brittle?
In stars, this process forms heavier elements from lighter ones.
What is nuclear fusion?