Question

determine whether each statement is true or false.
both the bohr model and the lewis dot structure represent an ionic bond formed between two nonmetal atoms.
a sodium cation has eight valence electrons.
valence electrons are shown in the bohr model of a chloride anion.
a chloride anion has seven valence electrons.

Explanation:

Statement 1:

Ionic bonds form between metals and nonmetals, while nonmetal - nonmetal bonds are covalent. Bohr model and Lewis dot structure for ionic bonds involve metal - nonmetal interactions. So this statement is false.

Statement 2:

Sodium (Na) has electron configuration $1s^{2}2s^{2}2p^{6}3s^{1}$. When it forms a cation ($Na^{+}$), it loses the 3s electron, so the valence shell (now the 2nd shell) has 8 electrons. So this statement is true.

Statement 3:

The Bohr model shows the electron shells, and valence electrons are the outermost electrons. For a chloride anion ($Cl^{-}$), the Bohr model will show the valence electrons (in the outermost shell). So this statement is true.

Statement 4:

Chlorine (Cl) has 7 valence electrons. When it forms a chloride anion ($Cl^{-}$), it gains one electron, so it has 8 valence electrons. So this statement is false.

Answer:

• "Both the Bohr model and the Lewis dot structure represent an ionic bond formed between two nonmetal atoms.": False
• "A sodium cation has eight valence electrons.": True
• "Valence electrons are shown in the Bohr model of a chloride anion.": True
• "A chloride anion has seven valence electrons.": False