Periodic Trends (Atomic Radius) CFU

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

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

• Ar
• He
• Kr
• Rn

The more protons there are, the  ____ .

• Weaker the pull
• Smaller the electrons
• Stronger the pull
• The bigger the electrons

Which one has the largest radius?

• Lithium (Li, atomic #3)
• Boron (B, atomic #5)
• Neon (Ne, atomic #10)
• Nitrogen (N, atomic #7)

Which of these best explains the reasoning behind the trend that as you go across a period, size decreases?

• As you go across a period, more energy levels are added, which shrinks the atom.

• The added electrons in the nucleus give the atom a negative charge, which shrinks the atom.

• The added protons in the nucleus pull the electrons closer to them, which shrinks the atom.

• All of the above

Which atom in the list below has the largest atomic radius?

• Argon (Ar)

• Helium (He)

• Krypton (Kr)

• Radon (Rn)

Arrange the elements lead, tin, carbon, and silicon in order of increasing atomic radius.

• Pb < Sn < C < Si

• Pb < Sn < Si < C

• C < Si < Sn < Pb

• C < Sn < Si < Pb

Which of the following is true of atomic radius?

• The radius is mainly due to how large an atom's nucleus is.

• The radius is mainly due to the size of the electron cloud.

• The atomic radius is a way we measure the mass of an atom.

• Neutrons account for the majority of an atom's radius.