Unit A: Section 2.0 Flashcards
What is the foundation for everything?
Elements
How many elements are in the periodic table?
118
What are elements?
Substances that cannot be broken down
How many naturally occurring elements are there?
90
How many synthetic elements are there?
25
What are the 3 groups that all elements can be classified into?
Metals
Non-metals
Metalloids
What category do most elements fall into?
Metals
Which category has the least elements?
Metalloids
What are the 6 common characteristics of metalloids?
- Silver or gray
- Shiny
- Good conductors
- Malleable
- Ductile
- Solid at room temperature
How does mercury differ from other metals?
It is a liquid at room temperature
What is room temperature?
25°
What is an example of a variable characteristic of a metal?
-How strongly metals react with other substances.
Which metals are highly reactive with air and water?
Sodium
What are some examples of inert metals?
Gold and platinum
What does inert mean?
Unreactive
How many elements are non-metals?
17
Why are non-metals grouped together?
Because of their lack of resemblance to metal instead of their similarities
What are about half of the non-metals grouped in?
A group called molecules
What type of variation is there in non-metals?
- Color
- State
What non-metal can etch glass?
Flourine
Which group on the periodic table is unreactive?
Noble gases
What are metalloids?
Elements that have properties that are intermediate between metals and non-metals
What properties does the periodic table organize elements by?
Chemical properties
Which side of the periodic table are the metals located on?
The left