Periodic Table Check

• Periods
• Groups

• energy levels
• valence electrons
• protons
• neutrons

• Metals
• Nonmetals
• Metalloids

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Looking at atoms in the same group/family, what factor affects Coulombic attraction?

• number of protons
• distance from the nucleus

Going across a period on the periodic table, as the nuclear charge increases the atomic radius: increases or decreases?

• increases
• decreases

Which element has the larger ionization energy: Aluminum (Al)    or    Chlorine (Cl)?

• Aluminum (Al)
• Chlorine (Cl)

Which element has the smaller atomic radius?

• Lithium (Li)

• Potassium (K)

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

• there are more neutrons

• there are more protons

• there are more shells (energy levels)

• the atomic mass is greater

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

• the effective nuclear charge (number of protons) increases, so attraction to electrons increases

• the number of energy levels increases
• the number of electrons increases in the valence energy level

• the atomic mass increases due to more protons and neutrons being added