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Atoms and the Periodic Table
Atoms and the Periodic Table
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1
in the atom represented below, the small dark circles represent electrons. The number of valence electrons is:
2
5
7
3
2
The chemical formula for a compound gives information about that compound. Which of the following is NOT true?
Chemical symbols for each element is given
Chemical formulas indicate polyatomic ions present
elements with negative oxidation are usually listed first
subscrips following symbols indicate the number of atoms present
3
How many valence electrons are in an atom of aluminum, atomic number 13?
1
3
2
4
4
Which of the following is the LEAST reactive group?
Alkali metals
Halogens
Noble gases
Group 2 metals
5
Bonding between atoms produces an outermost energy level for each atom filled with
16 electrons
32 electrons
8 electrons
1 electron
6
An atom that acquires an electrical charge by gaining or losing electrons is known as
a monatomic molecule
an ion
a free radical
a hydrate
7
Ionic bonds form
only between pairs of atoms
molecules
by sharing electrons
between oppositely charged atoms
8
Which statement is NOT TRUE about elements in group 16?
They have an oxidation number 2+
They need two electrons to complete their octet
they have an oidation number of 2-
They have six valence electrons
9
The diagram that best represents the Lewis dot diagram of a chlorine atom is
D
A
C
B
10
Sodium forms an ionic bond with chlorine when sodium ____ an electron and chlorine ____ an electron.
gains, loses
shares, shares
loses, loses
loses, gains
11
All organic compounds contain the element
nitrogen
hydrogen
oxygen
carbon
12
What is the oxidation number of a molecule of water, H20?
0
2-
1+
1-
13
The best Lewis dot diagram of bonding between lithium and oxygen atoms is:
B
C
A
D
14
Which of the following is TRUE for valence electrons?
each element in the periodic table has a different # of valence electr
may be lost or gained by an atom when bonding occurs with another atom
are found only in radioactive isotopes
are always located in the innermost energy level
15
Which of the following contains a polyatomic ion?
NaCl
Fe2O3
H2O
LiOH
16
Covalent bonding occurs
Only when electrons are shared between two identical atoms
when electrons are transferred from one atom to another
when electrons are shared between two atoms
in salts like NaCl
17
What is the largest number of valence electrons that an atom in the first period can have?
2
18
1
8
18
Chemical formulas represent the number and element of each type of atom in
covalent compounds only
both ionic and covalent compounds
ionic compounds only
mixtures only
19
Covalent bonds would most likely form between
a metalloid and oxygen
sodium and chlorine
magnesium and a halogen
an alkali metal and helium
20
What is the chemical formula for a compound that contains the aluminum ion (Al
3+
) and the hydroxide ion (OH
-
)?
Al(OH)3
AlOH3
AlO3H3
None of the above
21
What is the most common oxidation number for an atom of the element with 16 electrons?
1-
2-
1+
2+
22
Atoms that lose or gain electrons are called
mixtures
alloys
ions
elements
23
The atom of the element most likely to bond with a single atom of fluorine, atomic #9 is
lithium, atomic #3
boron, atomic # 5
beryllium, atomic #4
carbon, atomic #6
24
An ionic bond is most likely to form between
two oxygen atoms
nitrogen and oxygen atoms
lithium and fluorine atoms
carbon and oxygen atoms
25
Groups of atoms held together by covalent bonds are called
molecules
elements
alloys
mixtures
