Ionic Radii

The trend for ionic radius, is that when an atom gains electrons the radius will ​ (a)   . When an atom loses some electrons, the radius will​ (b)   .

• increase

• decrease

Which ion has the smallest radius?

• O^2-

• S^2-

• Se^2-

• Te^2-

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 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.

Tags

NGSS.HS-PS1-1

Which is the larger atom: F^-1, Cl^-1, Br^-1?

• F^-1

• Cl^-1

• Br^-1

• they are all the same size since they are all anions

Tags

NGSS.HS-PS1-1

When an atom gains an electron, the size of atom

• will increase

• will decrease

• will not change

Answer explanation

When an atom gains an electron, the size of the atom will increase due to the increased electron-electron repulsion, causing the electron cloud to expand.

When an atom loses an electron the size of atom

• will increase

• will decrease

• will not change

Answer explanation

When an atom loses an electron, the size of the atom will decrease. This is because the electron is negatively charged and its removal reduces the electron-electron repulsion, causing the remaining electrons to be pulled closer to the nucleus, resulting in a smaller size.

Which of the following statements are true?

• For metallic elements, the ionic radius > the atomic radius

• For metallic elements, the ionic radius < the atomic radius

• For nonmetallic elements, the atomic radius > ionic radius

• For nonmetallic elements, the atomic radius < ionic radius

Answer explanation

For metallic elements, the ionic radius < the atomic radius

Which of the following ions has the largest ionic radius?

• Na^+

• K^+

• Rb^+

• Cs^+

What happens to the ionic radius when an atom forms a cation?

• It increases

• It decreases

• It remains the same

• It becomes zero