Atoms, Periodic Table and Bonding

Atoms, Periodic Table and Bonding

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Multiple Choice

Which statement describes a chemical property of aluminum?

• Aluminum is malleable

• Aluminum has a high density

• Aluminum reacts with sulfuric acid.

• Aluminum conducts an electric current.

Multiple Choice

If an atom does not undergo radioactive decay, the number of protons within it will never change. This is why the number of protons is used to determine the

• number of covalent bonds an atom can form

• amount of energy needed to split an atom

• reactivity of an atom.

• element of an atom.

Multiple Choice

Which element is a noble gas?

• W

• N

• Ar

• Er

Multiple Choice

Atoms of elements that are in the same group have the same number of

• neutrons

• protons

• outer shell electrons

• protons and neutrons

Multiple Choice

The element copper most likely shares chemical properties with

• aluminum

• neon

• silver

• sodium

Multiple Choice

The elements in which section of the periodic table are the most stable and rarely react with other elements?

• metals

• metalloids

• halogens

• noble gases

Multiple Choice

Which statement best describes the elements located in group 17?

• The elements in group 17 are both halogens and metals

• The elements in group 17 are both noble gases and metals.

• The elements in group 17 are both halogens and nonmetals

• The elements in group 17 are both noble gases and nonmetals.

Multiple Choice

Using the periodic table, what are the charges on the ions of these elements: Na, Mg, and Cl?

• +1, +2, −1

• −1, +2, +1

• +2, +3, −1

• +1, −2, −1

PheT Atom

https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html

Multiple Choice

• 1

• 2

• 3

• 4

Multiple Choice

Which picture correctly models an atom from a lithium isotope?

Multiple Choice

How many total electrons are shared in a triple covalent bond?

• 2

• 4

• 6

• 9

Multiple Choice

Which of the following explains why helium is a stable element?

• It has a low atomic number

• It has a full duet in its outer energy level

• It easily gains or loses electrons.

• It has a low mass

Multiple Choice

Which compound is ionic?

• CaBr2

• NBr3

• CH4

• NO2

Multiple Choice

• Covalent compounds do not have bonds between nonmetals; they are between a nonmetal and a metal

• Covalent compounds do not have low melting and boiling points; they have high melting and boiling points.

• Covalent compounds do not dissociate into ions in an aqueous solution; they are not conductive in an aqueous solution

• Covalent compounds do not have weaker bonds than ionic compounds; they have stronger bonds than ionic compounds.

Multiple Choice

Which formula shows an ionic compound?

• MgH2

• N2O4

• ClO2

• SI4

Multiple Choice

Potassium (K), an alkali metal, and magnesium (Mg), an alkaline earth metal, both combine readily with bromine (Br), a halogen. What compound will each element (K and Mg) most likely form with bromine?

• KBr and Mg2Br

• KBr and MgBr

• K2Br and Mg2Br

• KBr and MgBr2

Multiple Choice

What is the chemical formula for calcium oxide?

• CaO

• Ca2O

• CaO2

• Ca2O2

Multiple Choice

Calcium (Ca) is in the second column of the periodic table and is classified as an alkaline earth metal. Which of the following formulas shows the ratio of a compound formed from calcium and iodine (I)?

• CaI

• Ca2I

• CaI2

• CaI3

Multiple Choice

Hector claims that a single sodium ion and a single oxygen ion do not bond together to form a stable binary ionic compound. Is he correct? Why or why not?

• Hector is incorrect. The two ions have opposite charges, so they will bond together in a binary ionic compound.

• Hector is incorrect. The two ions have more than eighteen protons, so they will bond together in a binary ionic compound.

• Hector is correct. The sum of the charges of the two ions must be zero in order for them to form a stable ionic compound.

• Hector is correct. The sum of the protons of the two ions must be divisible by eight in order for them to form a stable ionic compound.

Multiple Choice

Unknown element W has 2 valence electrons. Unknown element X has 7 valence electrons. Which formula shows the most likely outcome when elements W and X react?

• WX

• WX2

• W2X

• W2X2

Multiple Choice

What is the chemical formula for the stable ionic compound formed between aluminum and oxygen?

• AlO

• Al2O3

• Al3O3

• Al3O2

Multiple Choice

One molecule of dinitrogen tetroxide contains

• two nitrogen atoms and two oxygen atoms.

• four nitrogen atoms and two oxygen atoms.

• two nitrogen atoms and four oxygen atoms

• four nitrogen atoms and four oxygen atoms