Periodic Trends: Size & I.E.

Which of the following pairs of elements have similar properties. Remember they have the be in the same GROUP.

• Barium and Calcium
• Sodium and Magnesium
• Nickel and Copper
• Lithium and Helium 

Tags

NGSS.HS-PS1-1

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.

Ionization energy is the...

• energy needed to remove the outermost electron.
• ability of an atom to attract electrons from another atom.

Which element in Period 2 has the LARGEST atomic radius?

• Be

• C

• Na

• Li

Tags

NGSS.HS-PS1-1

Of the halogens, which has the SMALLEST radius?

• F

• Br

• He

• At

Which element has the LARGEST ionization energy?

• Carbon (C)

• Nitrogen (N)

• Oxygen (O)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element has the GREATEST metallic character?

• Lithium (Li)

• Helium (He)

• Phosphorus (P)

Tags

NGSS.HS-PS1-1

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

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

NGSS.HS-PS1-2