Unit 2: Sig Figs and Peridoic Table Flashcards
Precision
How close a series of measurements is to each other
_____=correct
Accuracy
_____=consistent
Precision
How to find percent error
|exp.- accepted| / accepted x 100
Order of measurement units
M_ KHDBDCm _ (u thing)_ _n
Common properties of Metals
Solid Good at losing electrons High density and melting point Most elements on the periodic table are this Mostly solids at room temperature
Properties of Alkali Metals
Very reactive
In group 1
Don’t occur often in nature
Form +1 ions
How many valence electrons does Alkali metals have?
1
Properties of alkaline earth metals
Low density
Very reactive
Form +2 ions
Number of valence electrons in Alkaline Earth Metals
2
Properties of Halogens
Very reactive
Gains electrons
Form -1 ions
Group 17
Number of valence electrons for Halogens
7 valence electrons
Accuracy
How close a measurement is to the accepted value
Properties of Noble Gases
Group 18 of periodic table Six noble gases Oxidation # is 0 Don't form ions Colorless and non-flammable
Number of valence electrons for Noble Gases
8(max. Number of valence electrons)
Properties of transition metals
High melting point
Less reactive than alkali metals
Properties of rare earth metals?
Occur naturally
Radioactive
High luster
Common properties of Metalloids
Non-metals that when mixed with metal form an alloy, has a mix of properties from metals and non-metals
Common properties of Non-metals
Good at gaining electrons Bad at losing them Gas at room temperature Brittle Poor conductors
