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

• you add more and more neutrons
• you add more and more protons
• you add more and more shells (energy levels)
• 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 number of protons increases, so attraction to electrons increases
• the number of energy levels increases
• the number of electrons increases
• the atomic mass increases

Tags

NGSS.HS-PS1-1

The energy required to remove electrons is the definition of: 

• Electronegativity
• Atomic Number
• Atomic Radius
• Ionization

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

• decreases, increases 
• increases, increases
• increases, decreases 
• stays the same, increases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which has the greater Electronegativity: 
N or C?

• C
• N

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

• Rn
• Cs
• Os
• Tm

Tags

NGSS.HS-PS1-1

The energy required to remove electrons is the definition of: 

• Electronegativity
• Atomic Number
• Atomic Radius
• Ionization

What is an "Atomic Radius"?

• The diameter of an atom
• Half the diameter of an atom
• The weight of an atom
• The mass of an atom

Which periodic group has the smallest atomic radius?

• Alkali metals
• Halogens
• Noble Gases
• Transition metals