Concepts
Electrons
Random
Families
Elements
100
Are the elements having the same outer electron arrangement.
What is Groups
100
Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called
What is isotopes
100
The modern periodic law is based on
What is atomic number
100
Each family, or group of elements in a vertical column of the periodic table has elements with chemical characteristics that are
What is similar
100
Compared to metals, nonmetals are
What is more brittle as a solid
200
This is the number of electrons needed to fill the outer shell of an atom.
What is Valance
200
The masses of all isotopes are based on a comparison to the mass a particular isotope of
What is carbon
200
A solution of sugar dissolved in water is
What is a homogeneous mixture
200
Which of the following elements belongs to the alkali family of elements: sodium; calcium; chlorine; neon
What is sodium
200
Under ordinary, room temperature conditions, the greatest number of elements are
What is metallic solids
300
These are the horizontal rows of elements on the Periodic Table
What is Period on the Periodic Table
300
The sum of the number of protons and neutrons in the nucleus of an atom is called the
What is mass number
300
One of these represents a physical change: electricity is used to generate oxygen and hydrogen from water; calcium carbonate is dissolved by stomach acid; solid ice is melted into liquid water; natural gas is burned as a heat source.
What is solid ice is melted into liquid water
300
Which of the following elements belongs to the halogen family of elements: sodium; calcium; chlorine; neon
What is chlorine
300
Carbon cannot be broken down into anything simpler by chemical means, so carbon must be
What is an element
400
These are the vertical columns of elements on the Periodic Table
What is Family in the Periodic Table
400
The weighted average of the masses of the stable isotopes of an element as they occur in nature is called the
What is atomic weight
400
This many naturally occurring elements are found on the earth in significant quantities
What is 89
400
An atom of an element belonging to the noble gas family has
What is all outer shell electrons
400
About 75 percent of the earth's solid surface is made up of
What is silicon and oxygen
500
This is a chart containing information about the atoms that make all the matter
What is Periodic Table
500
Isotopes are atoms of an element with identical chemical properties but with different
What is masses
500
The periodic table has this many elements
What is 118
500
An atom of an element belonging to the alkali metal family has
What is one outer shell electron
500
About 99 percent of the earth's atmospheric air is made up of
What is nitrogen and oxygen
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