matching
elements that show properties of both metals and nonmetals
a row of elements in the periodic table whose properties change gradually and predictability
able to be hammered into thin sheets
metalloid
periods
malleable
bromine and mercury are liquids at room temperature
most of the actinides occur naturally in Earth's crust
true
false, three
can be drawn out into a thin wire
metal
After completing his table, why did Mendeleev suspect that there were elements yet to be discovered?
He left gaps for missing elements.
My atomic number is 16 and my symbol is S, what element am I?
What is Selenium's state of matter?
sulfur
solid
most elements flow into this classification
series of radioactive elements
only nonmetal in group 1
metals
actinides
hydrogen
The most active metals are found in the noble gases family
silicon and germanium are used in electronics as semiconductors
false, alkali metals
true
a transition element
metal
Would you inspect the insulation around an electrical outlet to be made of metal, nonmetal, or metalloid? Why or why not?
nonmetal, it does not conduct electricity
My symbol is Al and my atomic number is 13. What element am I?
What is oxygen's atomic number?
What is the state of matter of silicon?
aluminum
8
solid
series of elements sometimes called rare earths
basis for arranging elements in modern periodic table
elements in groups 3-12 of the periodic table
lanthanides
atomic number
transition elements
a period contains elements that have similar properties
all transition elements are metals
false, group
true
a gas at room temperature
can be used as a semiconductor
nonmetal
metalloid
What are two series of inner transition elements, and what is a trait of each?
lanthanides- soft
actinides- radioactive
My symbol is Br and I am a liquid at room temperature. What element am I?
What is chlorine's atomic number?
What is the symbol of germanium?
bromine
17
ge
elements that are gases or brittle solids and poor conductors of heat and electricity
most chemically inactive group of elements
elements that show moderate electrical conductivity
nonmetals
noble gases
semiconductors
The element silver is used widely in dentistry
helium, argon, and radon are members of the halogen family
true
false, noble gases
a poor conductor of electricity
used for computer chips
nonmetal
metalloid
Explain why you would not expect to be able to combine magnesium and argon to produce a useful substance?
Argon is a noble gas which means it does not easily combine with other elements.
What is the symbol for phosphorus?
What is the state of matter of Fluorine?
What is the atomic number of arsenic?
P
gas
33
group of elements that form salts
another name for group 2 elements
silvery solids with low densities and low melting points found in group 1
halogens
alkaline earth metals
alkali metals
the nonmetals are not very important
lithium and sodium are members of the alkali metal family
false, essential for life
true
can be hammered into sheets
has a dull appearance and is brittle
metal
nonmetal
How does reading across a period of the periodic table compare with reading down a group on the table?
A period is a row whose properties change gradually and predictably and a group contains elements that have similar physical and chemical properties.
My symbol is N and my atomic number is 7. What element am I?
What is chlorine's atomic number?
What is the atomic number of carbon?
nitrogen
17
6