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WorksheetsChapter 9 "Elements and Chemical Bonds"
Total questions: 50
Worksheet time: 36mins
Which type of atoms are found in metallic bonds?
metal atoms
nonmetal atoms
salt atoms
valence atoms
Elements found on the far right of the periodic table in Group 18, are referred to as ____ and are chemically stable.
metals
nonmetals
metalloids
noble gases
How many dots are shown in the electron dot diagram for calcium, element number 20?
one
two
eight
twenty
In general, nonmetals are ____.
good conductors of electricity
malleable and ductile
good conductors of heat
gases at room temperature
Metallic compounds ____.
are poor conductors of electricity
dissolve in water
have low melting points
can be hammered into sheets
The particles that make up an atom are ____.
electrons, protons, and nuclei
elements, protons, and electrons
protons, neutrons, and nuclei
protons, neutrons, and electrons
Dot diagrams are used to represent ____.
protons
outer electrons
atomic mass
the structure of the nucleus
In the compound, H2O, the electrons in the bonds are unequally shared between oxygen and hydrogen, forming ____.
cations
ionic bonds
nonpolar molecules
polar bonds
Which type of bond is represented in the diagram?
covalent bond
ionic bond
metallic bond
electron bond
Which is true regarding the element neon on the diagram?
The element has eight valence electrons and is chemically stable.
The image shows how many electrons will bond with the element.
The image shows where it is located on the periodic table.
The groups of dots portray the number of bonds this element can form.
Atoms that gain electrons become ions with a ______ charge.
Which of the following is a compound?
gold
oxygen
neon
water
In a chemical formula, the number of each type of atom in the compound is shown by numbers called (a) .
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
a. 2
b. 4
c. 6
d. 8
An ion is an atom that has gained or lost _____.
In general, metals are _____.
a. poor conductors of heat
b. brittle
c. poor conductors of electricity
d. good conductors of heat
The maximum number of electrons in the second energy level of an atom is _____.
This formula shows the chemical reaction that occurs when the body breaks down sugar. How many carbon atoms are needed for this reaction to take place (reactants)?
Which type of molecular model is represented by the following diagrams?
H-H or O=C=O
a. dot diagram
b. structural formula
c. ball-and-stick model
d. space-filling model
In an atom, electrons _____.
a. are located in the nucleus
b. are paired with neutrons
c. travel outside the nucleus
d. are always in the same place in an atom
Why do the noble gases NOT form compounds readily?
a. They have empty outer energy levels
b. They have no electrons
c. They have seven electrons in the outer energy levels
d. Their outer energy levels have 8 valence electrons
What is the group number for elements that have a stable number of electrons in their outer energy level?
a. 18
b. 17
The millions of compounds that exist are made from approximately ___ elements on the periodic table.
50
75
115
150
Sodium is an atom represented as Na+. What does the “+” represent?
The plus sign means it can combine with almost every element found on the periodic table.
Sodium has a tendency to lose a valence electron when it becomes an ion.
Sodium has a tendency to gain a valence electron when it becomes an ion.
One positive sign is listed because it only takes one electron to make the atom neutral.
Why is the following image representative of a polar molecule?
The electrons are located at the poles of the molecule chain.
The valence electrons are shared equally.
The molecule has an overall positive change.
The valence electrons are shared unequally.
The properties of a compound are the same as the properties of the elements making up the compound.
True
False
Charged particles formed by gaining or losing electrons are called (a) .
The closer an electron is to the nucleus, the (a) its energy.
Most atoms are chemically (a) when its outer energy level holds 8 valence electrons.
For an atom to be neutral, the number of protons must equal the number of (a) .
Elements on the far right of the periodic table are classified as (a) .
The overall charge of an atom is (a) .
Because a water molecule has a slight positive charge at one end and a slight negative charge at the other end, it is a (a) molecule.
Identify the true/correct statements for each of the following components of an atom or chemical bond:
An electron carries a negative charge.
A positive ion has more protons than electrons.
A negative ion has more electrons than protons.
An ionic bond is formed when one atom gains an electron and the other loses an electron.
To become more chemically stable, an atom that has two electrons in its outer energy level will gain two electrons.
True
False
It is easier to remove an electron from the outer energy level than from one closer to the nucleus.
True
False
Atoms of different elements have different numbers of protons.
True
False
The energy of an electron varies depending upon which energy level that electron occupies.
True
False
In an atom, an electron that is close to the nucleus is on the highest energy level.
True
False
Elements that have the same number of valence electrons will be located in the same Group of the Periodic Table.
True
False
Atoms become more stable when they combine with other atoms to form compounds.
True
False
Atoms will transfer or share electrons to achieve a stable electron configuration.
True
False
Atoms are most stable when they have eight electrons in their outer energy level.
True
False
Atoms that gain or lose electrons are called electrons.
True
False
Atoms that share electrons are held together by covalent bonds.
True
False
Atoms that transfer electrons are held together by ionic bonds.
True
False
A molecule that has a slight positive and slight negative charge is called polar.
True
False
Compounds that have metallic bonds are good conductors of electricity.
True
False
Which element is located in Group 2 Period 4?
(a)
Which of the following elements is/are semi-metals/metalloids? (check all that apply)
Antimony
Silicon
Copper
Arsenic
