Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
period
|
horizontal rows that show repeating chemical and physical characteristics
|
|
|
family
|
elements in same vertical column
|
|
|
metals
|
solid, shiny, very reactive
good conductors of heat and electricity. Ex) iron, copper |
|
|
nonmetals
|
easily crushed, no shine or luster
poor conductors of heat and electricity |
|
|
metalloids
|
have properties of metals and nonmetals, dull in color, not malleable or ductile,semiconductors
|
|
|
periodic table
|
Mendeleev discovered the table of elements, repeating pattern
|
|
|
atomic number
|
number of protons, elements put in order of their atomic number
|
|
|
mass number
|
the sum of protons and neutrons
|
|
|
isotope
|
atoms of the same element with a different number of neutrons. C-12, C-14, Boron
|
|
|
atomic mass
|
average mass of the isotopes of an element found in nature. Decimal number under the symbol.
|
|
|
alkali metals
|
column I soft and can be cut with knife, malleable,
very reactive, metallic luster, conducts heat and electricity |
|
|
alkaline earth metals
|
column II not as reactive
beryllium, magnesium, calcium |
|
|
ion
|
when an element gains or loses an electron it becomes an ion
|
|
|
malleable
|
elements(metals) that can be pounded or rolled into sheets.
|
|
|
ductile
|
elements(metals)that can be pulled into wires.
|
