An allotrope of carbon that is soft and can be used as a lubricant is __.
a. silicon
b. diamond
c. sand
d. graphite
d
The process by which a solid changes directly to a gas without first becoming a liquid is called __.
a. condensation
b. ionization
c. sublimation
d. evaporation
c
In the gaseous state __ form diatomic covalent molecules.
a. noble gases
b. alkali metals
c. alkaline earth metals
d. halogens
d
When hydrogen reacts with the active metals, it __.
a. shares electrons
b. gains one electron
c. loses one electron
d. loses two electrons
b
Different forms of the same element that have different properties because of different atom arrangements are called __.
a. allotropes
b. carbons
c. silicons
d. graphites
a
At room temperature, most metals are __.
a. liquids
b. solids
c. radioactive
d. gases
b
An allotrope of carbon that is hard and is often used in jewelry is __.
a. silver
b. diamond
c. quartz
d. graphite
b
Metals can be usedas wire because they are __.
a. ductile
b. malleable
c. shiny
d. alloys
a
The __ often occur in nature as uncombined elements.
a. alkaline earth metals
b. alkali metals
c. actinide series
d. transition elements
d
Substances that conduct an electric current only under certain conditions are most likely to be __.
a. metals
b. nonmetals
c. metalloids
d. noble gases
c
The elements in Groups 3 through 12 of the periodic table are the __.
a. actinides
b. lanthanides
c. transition elements
d. noble gases
c
A group of elements that has two electrons in its oter energy level is the __.
a. alkaline earth metals
b. halogens
c. alkali metals
d. actinides
a
Hydrogen is grouped with the alkali metals because it __.
a. is a metal
b. has one electron in its outer energy level
c. is a gas
d. does not readily form compounds
d
Synthetic element are found in which of the following groups?
a. actinides
b. alkali metals
c. oxides
d. halogens
a
The bonding that occur when positively charged ions are surrounded by a cloud of eectrons is called __ bonding.
a. ionic
b. covalent
c. radioactive
d. metallic
d
All synthetic elements __.
a. are used in smoke detectors
b. are needed by the human body
c. are not typically found on Earth
d. have more than 92 protons
c
The only metal that is a liquid at room temperature is __.
a. silver
b. zinc
c. mercury
d. sodium
c
A synthetic element that is used in smoke detectors is __.
a. americium
b. sodium
c. technetium
d. aluminum
a
Bromine is the only halogen and nonmetal that is a __ at room temperature.
a. solid
b. liquid
c. gas
d. semiconductor
b
The iron triad of transition metals includes __.
a. iron, zinc, and copper
b. cobalt, iron, and nickel
c. copper, silver, and gold
d. zinc, cadmium, and mercury
b
The ablility of metals to reflect light is referred to as __.
a. luster
b. ductility
c. conductivity
d. malleability
a
Any element with an atomic number greater then 92 is a __.
a. transuranium element
b. lanthanide
c. transision element
d. halogen
a
Copper, silver, and gold are __ metals.
a. diatomic
b. radioactive
c. magnetic
d. coinage
d
Elemens that lie along the stair-step line of the periodic table are __.
a. liquids
b. metals
c. metalloids
d. radioactive
c
Three transition elements in Group 12 of the periodic table are __.
a. iron, nickel, and cobalt
b. mercury, zinc and cadmium
c. copper, silver, and gold
d. neon, helium, and xenon
b
Describe an allotrope
an allotrope is a form of an element that has a different molecular structure.
Explanation: all i got hope some of it helps :D
