Unit 13 Test

Which of the following is not true about valence electrons?

• Valence electrons are the electrons in the highest occupied energy level of an element.

• Valence electrons are the electrons that are usually involved in bonding between atoms.

• Valence electrons are the total number of electrons an atom contains.

• Valence electrons are related to the group number on the periodic table.

Which of the following shows the correct Lewis structure?

• A.

• B.

• C.

• D.

The octet rule states that:

• Atoms are most stable when they achieve the electron configuration of a noble gas - usually 8 valence electrons.

• Atoms are most stable when they lose or gain electrons equal to the number 8.

• 8 is the magic number in science and atoms respond to having 8 electrons.

• All atoms require 8 valence electrons - there are no exceptions to this rule.

Which of the following bonds would require the least amount of energy to break?

• N-N

• N=N

• N=N

How many valence electrons does Selenium (Se) have?

• 6

• 16

• 34

How many domains does S have in the following structure?

• 2

• 3

• 4

• 5

How many domains are in the following structure?

• 2

• 3

• 4

• 5

Which statement is not true regarding ionic, covalent bonding and the octet rule?

• Atoms, such as Li, will lose electrons and become positively charged in order to attain stability.

• Atoms, such as F, will gain electrons and become negatively charged in order to attain stability.

• Some atoms, such as C, will share electrons in order to attain stability.

• Atoms, such as Cl, will become negatively or positively charged when sharing electrons to attain stability.

VSEPR theory allows us to predict which of the following?

• The number of bonds in a molecule.

• The number of domains in a molecule.

• The 3-dimensional shape of a molecule.

Which of the following atoms is the most electronegative?

• O

• Ga

• Ca

• H