Based on the periodic table shown here, which elements will most likely form an ionic bond?

• N and O

• Si and Cl

• Na and Cl, and Li and F

• C and O

Under which of the following conditions will an atom be the most stable? 

• when they have the fewest possible valence electrons 

• when they have the maximum number of unpaired electrons 

• when all of the electron orbitals in the valence shell are filled 

• when all electrons are paired

Based on electron configuration, which of the elements would exhibit a chemical behavior similar to oxygen? 

• carbon

• nitrogen

• sulfur

• phosphorus

A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have the greatest difficulty clinging to a ________. 

• slightly damp surface

• surface of hydrocarbons 

• surface of mostly carbon-oxygen bonds 

• surface of mostly carbon-nitrogen bonds 

Which of the following models represents an atom that is most likely to form a cation with a charge of +1? 

• A

• B

• C

• D

Which of the following models represents an atom that is most likely to form an anion with a charge of -1? 

• A

• B

• C

• D

Titanium has an atomic number of 22. How many protons, neutrons, and electrons are in an isotope of titanium with mass number of 48?

• p = 22, n = 26, e = 22

• p = 11, n = 26, e = 11

• p = 11, n = 11, e = 70

• p = 11, n = 22, e = 48

What do elements with atomic numbers 6, 14, and 22 have in common?

• same number of electrons

• same atomic mass

• same number of valence electrons and will form the same number of covalent bonds

• all of the above

What type of bond is very prevalent in lipids and gives lipids their hydrophobic properties?

• polar covalent

• nonpolar covalent

• strong ionic

• weak ionic

An atom of oxygen has an atomic number of 8. How many electrons are in the first, second, and third electron shells, respectively?

• 2, 3, 3

• 2, 6, 0

• 8, 0, 0

• 0, 4, 4