Unit 3.2 Digital Lesson Flashcards
Period
A horizontal for of elements on the periodic table
Chemical symbol
An abbreviation of the name of an element
Metal
An element that is shiny and conducts electricity well
Non metal
An element that conducts heat and electricity poorly
Metalloid
An element that has properties of both metals and nonmetals
Group
A vertical column of elements on the periodic table that share properties
Average atomic mass
The weighted average of the masses of all naturally occurring isotopes of an element
How many elements are there and how many occur naturally
100 different elements; 92 occur naturally
How are the elements organized in the periodic table
By their physical and chemical properties
Valence electrons
Atoms of elements in a group have the same number of electrons in their outer energy level. These are known as valence electrons
Which type of element may be gasses at room temperature
Nonmetals
Semiconductors
Don’t conduct electricity as well as metals do
Valence electrons determine how or if an element
Reacts
What side of the periodic table are metals and nonmetals found
Metals are found in the left side of the periodic table; nonmetals are found on the right side of the periodic table
What does the group number tell you about the physical and chemical properties of an element
Elements of the same group can share the same chemical properties because they have the same number of valence electrons, and this makes elements react similarly
