1|Page
C371: Concepts In Science (WGU) |
Comprehensive Q&A For Certification
Success
Periodic law-correct-answer-the physical and chemical properties of the elements
are periodic functions of their atomic numbers
Periodic Table of Elements-correct-answer--Arranges all of the known elements
from left to right and top to bottom in order of increasing atomic number, and
they generally coincide with their increasing atomic mass
-Elements with similar properties fall into the same vertical columns to form
groups or families
-Properties of elements change greatly across any one row (period)
-In each element's square, the chemical symbol is in the middle, the atomic
weight is usually directly below the symbol, the atomic number is usually shown
at the top of the square
-As of 2006, the table contains 117 chemical elements whose discoveries have
been confirmed
-94 are naturally found on the earth, and the rest are synthetic elements that have
been produced artificially in particle accelerators
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noble gases-correct-answer-The Group 18 elements (helium, neon, argon,
krypton, xenon, and radon)
groups-correct-answer-Vertical columns on the periodic table
periods-correct-answer-Horizontal rows on the periodic table
molecular formula-correct-answer-represents the numbers and types of atoms in
a molecule
structural formula-correct-answer-a formula that shows the arrangement of
atoms in the molecule of a compound.
polyatomic ion-correct-answer-A covalently bonded group of atoms that has a
positive or negative charge and acts as a unit
chemical bond-correct-answer-a mutual attraction between two atoms resulting
from a redistribution of their outer electrons
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covalent bond-correct-answer-A chemical bond that involves sharing a pair of
electrons between atoms in a molecule
ionic bond-correct-answer-Formed when one or more electrons are transferred
from one atom to another
octet rule-correct-answer-a chemical rule of thumb that reflects observation that
atoms of main-group elements tend to combine in such a way that each atom has
eight electrons in its valence shell, giving it the same electronic configuration as a
noble gas.
Electronegativity-correct-answer-a measure of the tendency of an atom to attract
a bonding pair of electrons
chemical compound-correct-answer-consists of atoms of two or more different
elements combined in a fixed ratio
ionic compound-correct-answer-compound that contains ions and is held
together by ionic bonds. When a metal is combined with one or more nonmetals,
the compound is usually ionic.
C371: Concepts In Science (WGU) |
Comprehensive Q&A For Certification
Success
Periodic law-correct-answer-the physical and chemical properties of the elements
are periodic functions of their atomic numbers
Periodic Table of Elements-correct-answer--Arranges all of the known elements
from left to right and top to bottom in order of increasing atomic number, and
they generally coincide with their increasing atomic mass
-Elements with similar properties fall into the same vertical columns to form
groups or families
-Properties of elements change greatly across any one row (period)
-In each element's square, the chemical symbol is in the middle, the atomic
weight is usually directly below the symbol, the atomic number is usually shown
at the top of the square
-As of 2006, the table contains 117 chemical elements whose discoveries have
been confirmed
-94 are naturally found on the earth, and the rest are synthetic elements that have
been produced artificially in particle accelerators
,2|Page
noble gases-correct-answer-The Group 18 elements (helium, neon, argon,
krypton, xenon, and radon)
groups-correct-answer-Vertical columns on the periodic table
periods-correct-answer-Horizontal rows on the periodic table
molecular formula-correct-answer-represents the numbers and types of atoms in
a molecule
structural formula-correct-answer-a formula that shows the arrangement of
atoms in the molecule of a compound.
polyatomic ion-correct-answer-A covalently bonded group of atoms that has a
positive or negative charge and acts as a unit
chemical bond-correct-answer-a mutual attraction between two atoms resulting
from a redistribution of their outer electrons
, 3|Page
covalent bond-correct-answer-A chemical bond that involves sharing a pair of
electrons between atoms in a molecule
ionic bond-correct-answer-Formed when one or more electrons are transferred
from one atom to another
octet rule-correct-answer-a chemical rule of thumb that reflects observation that
atoms of main-group elements tend to combine in such a way that each atom has
eight electrons in its valence shell, giving it the same electronic configuration as a
noble gas.
Electronegativity-correct-answer-a measure of the tendency of an atom to attract
a bonding pair of electrons
chemical compound-correct-answer-consists of atoms of two or more different
elements combined in a fixed ratio
ionic compound-correct-answer-compound that contains ions and is held
together by ionic bonds. When a metal is combined with one or more nonmetals,
the compound is usually ionic.
