Periodic Trends

Which has the greater Electronegativity:

Cl or Al?

• Cl

• Al

Which has the greater Electronegativity:

N or C?

• C

• N

Families all have similar 

• Names
• atomic numbers
• atomic masses
• properties

Electronegativity is...

• how good an atom is at attracting electrons
• the ability of an atom to lose electrons
• the energy required to remove an electron from a specific atom
• how easy it is to make friends. 

Atomic radius generally increases as we move __________.  

• down a group and from right to left across a period 
• up a group and from left to right across a period 
• down a group and from left to right across a period 
• up a group and from right to left across a period 

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

The element with the largest electronegativity in the halogens is - 

• At
• F
• Cl
• Br

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

• K
• Kr
• Fe
• Fe

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

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium