Periodic Table Flashcards
What did Dimitri Mendeleev do?
-He was the first to arrange a periodic table in order of atomic mass
- noticed a repeating pattern of properties in the columns
-left spaces in his table for future discoveries
Mendeleev arranged a periodic table in order of ________ ______
Atomic Mass
___ years after Mendeleev, Henry Moseley arranged his table in order of _____ ____
50; Atomic number
In the periodic table columns are called ___ and __
Groups; families
how many columns in the periodic table
18
elements in the same groups have simmalar _____
Simmalar properties
in the columns of the periodic table, Atomic size increases from ____ to ___-
Top to bottom
Rows are called ____
Periods
the atomic number increases by ___ when you go across
1
in rows their are _____ _____ properties
No similar properties
single elements on the periodic table are ____
Oldest
In columns the number of ____ ____ an element has is the same.
Valance electrons
What is a valance electron
electrons in the outermost energy level of an atom
Most elements are
Metals
Metals are located ____ of the zig zag line
Left
physical properties of metal
-luster
-conducts heat & electricity
-high density
-high melting points
-ductile
-malleable
What does it mean if an element is Ductile
a metal able to be drawn out into a thin wire.
Chemical properties of metal
-1to 4 valance electrons
-lose valance electrons in chemical reactions
-will corrode in water or certain elements in The air
Non metals are most likely ___
Gas
nonmetals are found on the ___ of the zigzag line
Right
the physical properties of nonmetals are generall the ___ of metals
Opposite
Physical properties of Nonmetals
-no luster
-not conductive
-low density
-not ductile
-not malleable
-low melting point
Chemical properties of Nonnmetals
-have 5 to 8 valance electrons
-gain electrons in a chemical reaction
Metalloids are ___ the zigzag line
Are on
