POTASSIUM
Any element listed between the metals and nonmetals on the Periodic Table that has some properties of both groups
Semimetal
Substance made of two or more elements that are chemically combined
Compound
Letter or letters that abbreviate an element’s name
Chemical Symbol
Process in which one or more substances are changed into one or more different substances
Chemical Reaction
Any element in the far right column of the Periodic Table that generally does not combine with other elements
Substance that cannot be broken down into other substances
Element
The smallest piece of an element is called a(n) BLANK.
A. molecule
B. element
C. atom
D. compound
C. atom
Shorthand way to describe the chemical makeup of a compound
Chemoical Formula
The Periodic Table BLANK.
A. lists all known compounds
B. illustrates how molecules are formed
C. lists all known elements
D. organizes chemical formulas
C. list all known elements
Two or more atoms joined together by chemical bonds
Molecule
Who is the scientist who developed the most widely accepted model of the atom today?
A. John Dalton
B. J.J. Thomson
C. Ernest Rutherford
D. Erwin Schrӧdinger
D. Erwin Schrӧdinger
The elements in a compound often do not form a one-to-one ratio. The ratio is indicated by small numbers to the lower right of the symbols. This is called a BLANK.
A. superscript
B. numeral
C. indicator
D. subscript
D. subscript
Atoms of two different elements have different numbers of BLANK.
A. atoms
B. compounds
C. molecules
D. protons
D. protons
Any atom of a given element has the same number of BLANK in its nucleus.
A. protons
B. electrons
C. neutrons
D. orbits
A. protons
Most nonmetals are BLANK.
A. gases
B. solids
C. semimetals
D. plasma
A. gases
In the Periodic Table, atoms are arranged in order of increasing BLANK, which is the number of protons in their nuclei.
A. nuclei
B. atomic number
C. mass
D. neutrons
B. atomic number
Two or more elements can combine to form a BLANK.
A. molecule
B. atom
C. solution
D. compound
D. compound
The horizontal rows in the Periodic Table are called BLANK.
A. semimetals
B. sections
C. groups
D. periods
D. periods
Fe₂O₃ is the chemical formula for iron oxide. How many atoms of each element are present in this chemical formula?
2 Iron and 3 Oxygen
Each vertical column in the Periodic Table is called a BLANK.
A. group
B. row
C. period
D. section
A. group
Water is a unique compound. Describe at least two characteristics of water that make it unique.
1. Water is one of the few compounds that is a liquid at room temperature.
2. Water can dissolve more substances than any other liquid.
The properties of a compound are BLANK those of the substances that make them up.
A. exactly the same as
B. the reverse of
C. different from
D. more intense than
C. different from
Describe metals and non-metals. What are some differences? What are some similarities?
Metals: Conducts electricity, malleable, luster
Nonmetals: Does not conduct electricity, brittle, dull
A scientist has an unknown gas in a container. By experimenting, she has found that the gas will not combine with any other element. This gas is most likely which type of element?
A. semimetal
B. alkali metal
C. noble gas
D. metal
C. noble gas
Elements and compounds BLANK.
A. are pure substances
B. are made up of atoms
C. have specific properties
D. are all of the above
D. are all of the above