Atomic numbers and atoms
A chart that organizes all known elements by atomic number and similar properties.
What is a periodic table?
These are vertical columns on the periodic table that show elements with similar properties
what are groups?
This family include Lithium,sodium, and potassium and is known for being very reactive
What are the alkali metals?
These elements are shiny, conductive, and malleable
What are metals?
Atomic number is important because it identifies the element and determines this
What is an elements chemical behavior?
These are vertical columns on the periodic table that show elements with similar properties
What are periods?
This family contains oxygen, sulfur, and selenium
What are the chalcogens?
These elements are usually dull and poor conductors of electricity
What are non-metals
Elements on the periodic table are arranged in order of increasing this
What is atomic number?
Elements in the same group usually have the same number of these outer electrons
What are valence electrons
These elements are found in group 17 and are highly reactive non metals
What are halogens
Elements have properties of both metals and non-metals called these
What are metalloids
Changing this number changes the identity of the element
What is the number of protons?
Moving left to right across a periodic table, elements generally become less metallic and more___
What is non metallic?
These elements are located in the center of the periodic table
What are transition metals
This Zig-Zag line on the periodic table separates the metals from the non metals
What is the stair-step line
The subatomic particle determines an elements place on the periodic table.
What is the proton?
All elements in the same period have the same number of these.
What are energy levels?
This family of elements is known for being unreactive and is found in group 18
What are noble gases
Silicon is an example of this type of element
What is a metalloid