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worrksheet

Sodium reacts with chlorine to form

NaCl

Hydrogen and nitrogen react to form

NH3.

Calcium reacts with chlorine to form

CaCl2

From the periodic table, the number of valence electrons for most of the main group elements may
be determined directly from the

Group Number

In the formula for copper(II) phosphate, the number of phosphorus atoms is

two

An element with 7 electrons in its outer shell is in which group on the periodic table?

Group 7A

How many dots will appear in the Lewis dot structure for an element from in Group 1A of the
periodic table?

one

Chalk is primarily composed of calcium carbonate. The formula of calcium carbonate is

CaCO3.

Sodium hydroxide is commonly known as lye. The formula of sodium hydroxide is

NaOH

An electron-dot structure is a convenient method of representing

valence electrons of an atom

The number of protons in a sodium ion, Na+, is

11

What is the name of NaH2PO4?

sodium dihydrogen phosphate

The attraction between positive and negative ions is known as a(n)

ionic bond

What is the formula of ammonium nitrate?

NH4NO3

The prefix which means seven is

hepta

Noble gases are unreactive because of their electronic structures. The kind of reasoning that states
"if other elements could be made to achieve noble gas electronic structures they would be more
stable" is called ________.

deductive reasoning

If a central atom has four electron sets attached to it, the geometry about the central atom is

tetrahedral

Why do chemists use the Lewis symbols to represent chlorine and sodium rather than drawing the
electron diagrams of each element before and after the reaction?

Lewis symbols are easier to use

In a molecule of nitrogen, N2, the nitrogen atoms are bonded to each other by

a triple covalent bond

Magnesium reacts with oxygen to form

MgO

The electron dot formula for carbon dioxide, CO2, is

look at worsheet

All of the following species are isoelectronic to Mg2+ EXCEPT

Li+.

The inertness of the noble gases is due to

the number and arrangement of their electrons.

Which of the following molecules is NOT likely to exist?

He2

What is the name of the compound with the formula CCl4?

carbon tetrachloride

When magnesium reacts with chlorine, magnesium ions, Mg2+, and chloride ions, Cl-, are formed.
In this reaction, magnesium atoms

lose electrons.

With respect to chemical bonding, which particles play the least active role?

nucleons

In a nonpolar covalent bond, electrons are

shared equally.

If a central atom has a total of three electron sets and no lone pairs attached to it, the geometry
about the central atom is

triangular.

The nature of bonding forces in a piece of matter influences which observable property of the
matter?

all of the above

An oxide ion is

O2-.

Which is the electron dot structure of sulfur?

cant draw picture

The shape of a methane molecule is best described as

tetrahedral.

All of the following pairs are isoelectronic EXCEPT

K and Ar.

Which substance has polar covalent bonds?

NH3

The formula of magnesium nitride is

Mg3N2.

Which substance has ionic bonds?

K2S

Which of the following statements about molecules is correct?

A compound that contains only polar bonds can be nonpolar.

Which atom is least likely to form an ion?

carbon, C

In a polar covalent bond, electrons are

shared unequally.

How many iron atoms are in the formula for iron(III) oxide?

2

NO2- is the ________ ion.

nitrite

Which of the following pairs is isoelectronic?

Ar and S2-

The shape of the sulfur dioxide molecule, where sulfur is the central atom is

bent.

A nonpolar covalent bond will form between atoms that have an electronegativity difference of

< 0.5

The correct formula for the nitrite ion is

NO2-.

The formula for the compound magnesium fluoride is

MgF2.

When ions arrange themselves in an orderly structure, that structure is known as a

crystal.

A lithium ion is

Li+.

Which of the following is a binary compound?

NaCl

Which is the electron dot structure for nitrogen, N2?

cant draw picture

The formula of sodium chromate is

Na2CrO4.

When calcium reacts with chlorine, the reaction involves a

transfer of electrons from Ca to Cl.

Which atom is least likely to form an ion?

carbon

A covalent bond is formed when a pair of electrons is

shared.

In the formula for ammonium nitrate, the number of nitrogen atoms is

two.

The best description of the shape of an ammonia molecule is

pyramidal.

The number of electrons in a sodium ion, Na+, is

10

Which of the following molecules is polar?

CH2Cl2

Acetylene is used in high temperature metal cutting torches. The formula of acetylene is C2H2.
The structure of acetylene is

H-C􀁍C-H. (look at worksheet)

The name of the compound with the formula AlCl3 is

aluminum chloride.

In the hydrogen chloride molecule, HCl, the chlorine end of the molecule is more negative than the
hydrogen end because

chlorine is more electronegative than hydrogen.

How many phosphorus atoms are in the formula for potassium dihydrogen phosphate?

1

A lone pair of electrons

occupies a larger volume than a bonding pair.

Which is the electron dot structure of nitrogen?

look at worksheet

For which atom is it difficult to predict the most probable ionic charge using the periodic table?

Co

An ionic bond is formed when electrons are

transferred.

For which atom is it difficult to predict the most probable ionic charge using the periodic table?

Fe

The electron dot formula for carbon monoxide, CO, is

look at worksheet

When two chlorine atoms combine with each other, the bond that forms is

nonpolar covalent.

A chloride ion, Cl- has the same electron configuration as a(n)

argon atom.

Which substance has ionic bonds?

KBr

Which substance has covalent bonds?

CO2

Hydrogen and sulfur react to form

H2S.

With respect to chemical bonding, which particles play the most active role?

valence electrons

Which term fits this definition? A measure of the tendency of an atom in a molecule to attract a
shared pair of electrons to itself.

electronegativity

Chlorine forms monatomic ions with a charge of

1-.

How many nitrogen atoms are in the formula for magnesium nitride?

2

The shape of a water molecule is

bent.

Which substance has ionic bonds?

CaO

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