Unit 3 Learning Check 2 Review

Draw the trends of increasing atomic radii, electronegativity, and 1st ionization energy on the periodic table to the right.

Which of the following is the correct order of atoms for increasing atomic radii?

• He, F, P, Ca, Cs

• Cs, Ca, P, F, He

• F, He, P, Cs, Ca

• P, F, He, Cs, Ca

Which of the following is the correct order of atoms for decreasing electronegativity?

• He, F, P, Ca, Cs

• F, He, P, Ca, Cs

• F, P, He, Ca, Cs

• He, F, Ca, P, Cs

Which of the following has the smallest 1st ionization energy? He, Ca, Cs, P

• He

• Ca

• Cs

• P

Which of the following has the largest atomic radii? Co, As, Ca, Br

• Co

• As

• Ca

• Br

Define valence electrons. How do you determine the number of valence electrons for an atom?

• Valence electrons are the electrons in the outermost shell of an atom. You determine the number of valence electrons by looking at the group number of the element in the periodic table.

• Valence electrons are the electrons in the innermost shell of an atom. You determine the number of valence electrons by looking at the atomic number of the element.

• Valence electrons are the electrons in the outermost shell of an atom. You determine the number of valence electrons by looking at the atomic mass of the element.

• Valence electrons are the electrons in the innermost shell of an atom. You determine the number of valence electrons by looking at the period number of the element.

An atom with a charge due to gaining or losing electrons is called an _________.

Which type of ion is formed when atoms gain electrons? And what is the overall charge?

• Cation, positive charge

• Anion, negative charge

• Cation, negative charge

• Anion, positive charge

Which type of ion is formed when atoms lose electrons? And what is the overall charge?

• Cation, positive charge

• Anion, negative charge

• Neutral ion, no charge

• Radical ion, variable charge

What is the Octet Rule and why do atoms want to follow it?

• The Octet Rule states that atoms tend to gain, lose, or share electrons to have eight electrons in their outer shell, achieving a stable electron configuration similar to noble gases.

• The Octet Rule states that atoms tend to gain, lose, or share electrons to have six electrons in their outer shell, achieving a stable electron configuration similar to noble gases.

• The Octet Rule states that atoms tend to gain, lose, or share electrons to have ten electrons in their outer shell, achieving a stable electron configuration similar to noble gases.

• The Octet Rule states that atoms tend to gain, lose, or share electrons to have four electrons in their outer shell, achieving a stable electron configuration similar to noble gases.