Periodic Trends

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.

The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

Which periodic group has the smallest atomic radius?

• Alkali metals
• Halogens
• Noble Gases
• Transition metals

Ionization energy is...

• the energy required to add an electron to a specific atom
• how much energy it takes to remove an electron from an atom
• the energy required to shield the outer electrons from the nucleus
• a measure of the ability of an atom to attract electrons

Which of the following will have a lower ionization energy than Scandium (Sc)?

• Helium (He)
• Titanium (Ti)
• Calcium (Ca)
• Magnesium (Mg)

Which of the following will have a higher ionization energy than arsenic (As)?

• Gallium (Ga)
• Neon (Ne)
• Antimony (Sb)
• Germanium (Ge)

What term is used to describe "A measure of the size of an atom"

• chemical reactivity
• atomic radius
• energy levels
• orbit

Define electron affinity.

• The energy it takes to add an electron to an atom.
• The energy it takes to remove an electron from an atom.

Put the following in order of increasing ionization energy:Strontium, Aluminum, Indium

• Strontium, Indium, Aluminum
• Strontium, Aluminum, Indium
• Indium, Aluminum, Strontium
• Aluminum, Indium, Strontium