Ionic Radius Practice

What is the trend for ionic radius across a period for anions?

• increase

• decrease

• remain constant since they are all the same type of ion

What is the trend for ionic radius across a period for cations?

• increase

• decrease

• remain constant since they are all the same type of ion

What is the trend for ionic radius down a group?

• increase

• decrease

• remain constant

What is a cation?

• A negative ion formed from the gaining of electrons.

• A positive ion formed from the gaining of electrons.

• A negative ion formed from the loss of electrons.

• A positive ion formed from the loss of electrons.

What is an anion?

• A negative ion formed from the gaining of electrons.

• A positive ion formed from the gaining of electrons.

• A negative ion formed from the loss of electrons.

• A positive ion formed from the loss of electrons.

Which ion has the smaller radius?

• P^-3

• Cl^-1

• S^-2

• all are anions in the same period so they are the same size

Which is larger:

P or P^-3 ?

• P because it is the neutral atom.

• P^-3 because it lost 3 electrons.

• P^-3 because it gained 3 electrons.

• They are the same size since they are both P.

A sodium atom (Na) loses an electron to form a sodium ion (Na⁺¹). Which statement is correct in regards to describing the ionic radius.

• The sodium ion (Na⁺¹) has a larger radius than the neutral sodium atom (Na).

• The sodium ion (Na⁺¹) has a smaller radius than the neutral sodium atom (Na).

• The sodium ion (Na⁺¹) and the neutral sodium atom (Na) are the same size because they are both sodium.

• The sodium ion (Na⁺¹) has twice the radius of the neutral sodium atom (Na).

Which is the smaller atom: Mg or Mg⁺²?

• Mg because it gains an energy level since it gains 2 electrons.

• Mg due to extra electron repulsion created by gaining 2 electrons.

• Mg⁺² because of extra electron repulsion created by gaining 2 electrons.

• Mg⁺² because it loses an energy level since it loses 2 electrons.

Arrange the following by decreasing ionic radius: Ag⁺¹, In⁺³, Cd⁺², Sn⁺⁴?

• Ag⁺¹, In⁺³, Cd⁺², Sn⁺⁴

• Ag⁺¹, Cd⁺², In⁺³, Sn⁺⁴

• Sn⁺⁴, In⁺³, Cd⁺², Ag⁺¹

• Sn⁺⁴, Cd⁺², In⁺³, Ag⁺¹