Periodic Trends

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

As you move down the periodic table atoms get bigger.  This is because ____________.

• The atoms have more mass.
• The atoms have more protons.
• The atoms have more energy levels
• The atoms have more nuetrons

As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.
• the atoms have less mass
• the atoms have more protons.
• the atoms have less electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Order the following in increasing atomic radii: 
Ra, Be, Ca, Rb, H

• Ra, Be, Rb, H, Ca
• Rb, H, Ca, Be, Ra
• Ra, Rb, Ca, Be, H
• H, Be, Ca, Rb, Ra

Tags

NGSS.HS-PS1-1

The distance between the nucleus of an atom and the outer edge of the electron cloud

• Atomic radius
• Ionic Radius
• Ionization Energy
• Electronegativity

The concept of shielding happens because of

• attraction between nucleus and valence electrons
• attraction between nucleus and core electrons
• repulsion between valence electrons and other valence electrons
• repulsion between core electrons and valence electrons

Shielding electrons are: 

• Electrons in the highest energy level
• Electrons in the lower energy levels
• Electrons that just come and go - they don't stay with the atom
• Electrons that are excited

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Valence electrons are: 

• Electrons in the highest energy level
• Electrons closest to the nucleus
• Electrons that just come and go - they don't stay with the atom
• Electrons that are excited

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Shielding electrons causes the force of attraction to the nucleus to 

• increase
• decrease

Tags

NGSS.HS-PS1-3

In moving from left to right across a period on the periodic table, the effective nuclear charge

• increases
• decreases
• stays the same

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2