Describing and Explaining Periodic Trends

The element with the smallest ionization energy in Period 6 is - 

• Rn
• Cs
• Os
• Tm

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The element with the largest ionization energy in Group 13 is - 

• Tl
• In
• Al
• B

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The element with the lowest electronegativity in Period 3 is - 

• Na
• Cl
• Ar
• Mg

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

As you move down a group, atomic radius increases because - 

• you add more and more neutrons
• you add more and more protons and Coulombic attraction increases
• you add more and more shells (energy levels) and repulsion increases
• you add more atomic mass

The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

Tags

NGSS.HS-PS1-1

As you move across the periodic table from left to right, the atomic radius decreases.  This is because - 

• the effective nuclear charge increases, so attraction to electrons increases
• the shielding effect increases
• the number of electrons increases
• the atomic mass increases

Tags

NGSS.HS-PS1-1

The atom with the largest atomic radius in Period 4 (row 4) is - 

• K
• Kr
• Fe
• Fe

The Br^- anion is larger than the Br atom because - 

• Br^- has more electrons than Br, and more electrons repel each other
• Br has more electrons than Br^-, and more electrons repel each other
• Br^- has higher Zeff than Br, so its attraction for its electrons increases
• Br has more electrons than Br^-_, so its Zeff increases

Tags

NGSS.HS-PS1-1

Na⁺ and Mg²⁺ are isoelectronic. Which one will be smaller in radius, and why?

• Mg²⁺, because it has less electrons and greater repulsion between them
• Mg²⁺, because it has more protons and greater effective nuclear charge
• Na⁺, because it has less electrons and a weaker shielding effect
• Na⁺, because it has more protons and a stronger shielding effect

Tags

NGSS.HS-PS1-1

Francium (Fr) has the lowest ionization energy in Group 1 because - 

• it has the smallest number of valence electrons
• it has the greatest atomic mass
• it has the greatest effective nuclear charge, so it feels little Coulombic attraction to the nucleus
• its valence electron is well shielded, so it feels little Coulombic attraction to the nucleus

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2