Chemical Bonding Worksheet
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4Grade 9 Science Related Reading/Materials
Name:____________________
Materials Gr9
Class:____________________
Chemical Bonding
Date:____________________
What Is a Chemical Bond?
All things are made of atoms. A few substances are
made of single atoms, but most are made of two or more
atoms joined together. Chemical bonding is the joining of
atoms to form a new substance. The bond that forms when
two atoms join is called a chemical bond.
Explain: What can
happen to electrons in
Which Electrons Affect Bonding?
an atom when a
Atoms form chemical bonds when their electrons interact
chemical bond forms?
with one another. However, not all of the electrons in an
___________________
atom interact to form bonds. In most cases, only the
___________________
electrons in the outermost energy level are able to form
___________________
bonds. Electrons in the outermost energy level are called
___________________
valence electrons. An atom can form different kinds of
___________________
bonds depending on how many valence electrons it has.
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Why Do Atoms Bond?
Some atoms form bonds easily. Others don’t.
An atom forms a bond with another atom in order to
complete, or fill, its outermost energy level. An atom is
most stable when its outermost energy level is full.
Apply Concepts: What
is the charge of a
How Do Ionic Bonds Form?
nickel atom that has
There are several types of chemical bonds. An ionic
lost two electrons?
bond is one type. Ionic bonds form when valence electrons
__________________
are transferred from one atom to another.
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Like other bonds, ionic bonds form so that the outermost
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energy levels of the atoms are filled. To understand
__________________
why ionic bonds form, you need to learn what happens
when atoms gain or lose electrons. An electron has a
negative electrical charge. A proton has a positive electrical
charge. An atom is neutral, or not charged, when it has an
equal number of electrons and protons. The electrical charges
cancel out each other. When atoms gain or lose electrons,
the numbers of protons and electrons are no longer equal.
When this happens, atoms become charged particles called ions.
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