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100
Metals are good conductors of this.
What is electricity?
100
These elements that do not conduct electricity.
What are non metals?
100
These elements fall between metals and non metals in the periodic table.
What are metalloids?
100
These are the rows of the periodic table.
What are periods?
100
These are the 3 classes of elements.
What are metals, metalloids, and non metals?
200
Transition metals are all ______________ metals?
What is radioactive?
200
In group 1 of the periodic table, all elements are alkali metals except ___________.
What is hydrogen?
200
Elements are grouped together when they have similar __________.
What are properties?
200
These are the columns of the periodic table.
What are groups?
200
The table of elements is called a periodic table because of this.
What is a repeating pattern?
300
The atomic number is the number of __________ found in an element.
What are protons?
300
Elements in the periodic table go from metals to _________ and then to ___________ as you go from left to right across the table.
What are metalloids and non metals?
300
Element groups 13-16 each contain ___________metalloid.
What is one?
300
What elements are organized by in the modern periodic table.
What is atomic number?
300
This reacts violently with alkali metals, which have one valence electron.
What are halogens?
400
The name for the electrons in the outer energy level of an atom.
What are valence electrons?
400
The 18th Group of elements (also a group composed of non metals).
What are noble gases?
400
Besides the atomic number, the periodic table includes each element's __________ ____________ and ___________.
What are chemical symbol and class.?
400
An important measure of a good model is its ability to make this.
What is accurate predictions?
500
Elements in the same column, or group, of the periodic table have the same number of __________ __________ in their outer energy level.
What are valence electrons?
500
The number of valence electrons determine these 2 things.
What is element reactivity and conductivity?
500
These are the seven different metalloids found on the periodic table.
What are boron, silicon, germanium, arsenic, antimony, tellurium, polonium?
500
The modern periodic table is organized from __________ to___________, with each element having one more __________ than the element before it.
What are left, right, and proton?
500
This person invented the modern periodic table.
Who is Dmitri Mendeleev?