Periodic Table
The modern periodic table organizes elements according to this.
What is increasing atomic number?
Periodic trend that increases from left to right across a period and increases from top to bottom in a group.
What is number of protons?
Metals form this type of ion.
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What are cations?
The very reactive elements in group 1 are known as this.
What are alkali metals?
The horizontal rows on the periodic table.
What are periods?
The three classes of elements.
What are metals, nonmetals and nonmetals?
The period numbers indicate this.
What is number of energy levels?
Elements that have characteristics of both metals and nonmetals.
What are metalloids (semiconductors)?
The reason why Noble gases are stable.
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What is a full outer energy level?
Being shiny, malleable, and conductors are properties of this class of elements.
What are metals?
Electrons that can most easily be lost, gained, and shared (on the outside "ring").
What are valence electrons?
The reactive elements in group 2 are known as this.
What are alkali earth metals?
Elements in the same group share these characteristics.
What are chemical and physical properties, number of valence electrons?
Who organized the periodic table to look like it does today?
Who is Dmitri Mendeleev?
The elements in group 17 are known as this.
What are the halogens?
Nonmetals form this type of ion.
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What are anions?
The vertical columns on the periodic table.
What are groups or families?
Group/family numbers can be an indication of this.
What is number of valence electrons?
The nonreactive elements in group 18 are known as this.
What are the noble gases?
Number of periods on the periodic table.
What is 7?