CHEM 101 Final: Chapter 6 Flashcards

Questions and Answers

The number of valence electrons found in an atom of a Group A element is equal to:

Its mass number

Its group number (correct)

Eight

Its atomic number

Eight minus the group number

How many valence electrons are in the electron-dot structures for the elements in group 3A(13)?

3 (correct)

How many valence electrons does nitrogen have?

One

Five (correct)

Three

Two

Four

How many electrons will aluminum gain or lose when it forms an ion?

Lose 3 Signup and view all the answers

What is the symbol for the ion with 19 protons and 18 electrons?

K+ Signup and view all the answers

The number of electrons in an ion with 20 protons and an ionic charge of 2+ is:

18 Signup and view all the answers

Elements in group 2A(2) of the periodic table form ions with a charge of:

2+ Signup and view all the answers

What is the correct formula for the oxide ion?

O2- Signup and view all the answers

An ionic compound:

Has a net charge of zero Signup and view all the answers

The correct formula for the compound formed from Mg and S is:

MgS Signup and view all the answers

Which one of the following compounds contains an ion with a 3+ charge?

FeCl3 Signup and view all the answers

Which one of the following elements forms two or more ions with different ionic charges?

Fe Signup and view all the answers

What is the correct formula for lead (IV) oxide?

PbO2 Signup and view all the answers

The name of Al2(SO4)3 is:

Aluminum sulfate Signup and view all the answers

The formula for copper (II) sulfate is:

CuSO4 Signup and view all the answers

What are the ions present in Al2(SO4)3?

Al3+, SO4 2− Signup and view all the answers

What is the charge on the Fe ion in the molecule Fe2(CO3)3?

3+ Signup and view all the answers

The formula for a compound containing ammonium ion and phosphate ion is:

(NH4)3PO4 Signup and view all the answers

In a molecule with covalent bonding:

Atoms are held together by sharing electrons Signup and view all the answers

The name of the compound SO3 is:

Sulfur trioxide Signup and view all the answers

The formula for a molecule formed from N and Cl would be:

NCl3 Signup and view all the answers

What is the formula of carbon tetraiodide?

CI4 Signup and view all the answers

Which of the following elements does NOT exist as a diatomic molecule?

Carbon Signup and view all the answers

How many valence electrons are in the electron-dot structure of H2O?

8 Signup and view all the answers

How many lone pairs of electrons are in the electron-dot structure of H2O?

2 Signup and view all the answers

The ability of an atom to attract the shared electrons in a covalent bond is:

Electronegativity Signup and view all the answers

Which of the following substances contains a polar covalent bond?

NH3 Signup and view all the answers

Ionic bonding is expected in which of these compounds?

KF Signup and view all the answers

The shape of the carbon tetrachloride molecule is:

Tetrahedral Signup and view all the answers

The electron group geometry of NH3 molecule is:

Tetrahedral Signup and view all the answers

The carbon tetrachloride molecule, CCl4, is:

A nonpolar molecule with polar bonds Signup and view all the answers

The strongest interactions between molecules of ammonia (NH3) are:

Hydrogen bonds Signup and view all the answers

The strongest interactions in the compound sodium fluoride, NaF, are examples of:

Ionic bonds Signup and view all the answers

Study Notes

Valence Electrons and Ion Charges

The number of valence electrons in a Group A element equals its group number.
Group 3A(13) elements have three valence electrons.
Nitrogen has five valence electrons.
Aluminum loses three electrons to form a +3 ion.

Ionic Charges and Compounds

The ion with 19 protons and 18 electrons is K+.
An ion with 20 protons and a 2+ charge has 18 electrons.
Group 2A(2) elements form ions with a 2+ charge.
The formula for the oxide ion is O2-.
Ionic compounds have a net charge of zero.
The formula for magnesium and sulfur compound is MgS.
FeCl3 contains an ion with a 3+ charge.
Iron (Fe) can form multiple ions with different charges.
Lead (IV) oxide's correct formula is PbO2.

Chemical Formulas and Naming

Al2(SO4)3 is named aluminum sulfate.
The formula for copper (II) sulfate is CuSO4.
The ions present in Al2(SO4)3 are Al3+ and SO4 2-.
The charge on the Fe ion in Fe2(CO3)3 is 3+.
The compound containing ammonium ion and phosphate ion is (NH4)3PO4.

Covalent Bonds

In covalent bonding, atoms are held together by shared electrons.
The compound SO3 is named sulfur trioxide.
The formula for a compound of nitrogen and chlorine is NCl3.
The formula for carbon tetraiodide is CI4.

Molecular Structure

Carbon does not exist as a diatomic molecule while H2, N2, Cl2, and O2 do.
H2O has eight valence electrons in its electron-dot structure.
H2O has two lone pairs of electrons shown in its structure.
Electronegativity indicates an atom's ability to attract shared electrons in a bond.
NH3 contains a polar covalent bond.
Ionic bonding predominantly occurs in KF.

Molecular Geometry

The shape of carbon tetrachloride (CCl4) is tetrahedral.
NH3 also has a tetrahedral electron group geometry.
CCl4 is a nonpolar molecule with polar bonds.

Intermolecular Forces

The strongest interactions in ammonia (NH3) are hydrogen bonds.
Sodium fluoride (NaF) has the strongest interactions due to ionic bonds.

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Test your knowledge of valence electrons and electron-dot structures with these flashcards from CHEM 101 Chapter 6. Each question challenges you to recall essential concepts related to group A elements and their properties. Perfect for final exam preparation!