10. Periodic Properties of the Elements

Arrange the following atoms in order of decreasing atomic radius:Sr, Se, Ne, Zn

Which alkaline earth metal has the smallest atomic radius? 

In moving from top to bottom in the same column on the periodic table, what trend is expected for atomic size? 

What trend in size of the atom do you see as you move down a group?

Which element, oxygen (O) or fluorine (F), has a smaller atomic radius?

The experimental Bi−I bond length in bismuth triiodide, BiI₃, is 2.81 Å. Based on this value and data in the figure, predict the atomic radius of Bi.

The atomic radius of an element ____________ when you move from the top to the bottom of a family.

The trend towards smaller atomic radii as one moves to the right in a period is _____.

Atomic radius generally increases as we move ________.

Which statement best describes the trend in atomic radii observed in the periodic table?

What trend in size of the atom do you see as you move down a group?

How do you think the size of an atom will affect its ability to attract additional electrons

As you move across the periodic table atoms tend to get smaller because, ______________.

As you travel down a group atomic radius (decreases/increases). Why

Which of these describes atomic radii as one moves from top to bottom within a group

Which of these describes a tendency for atomic radii as displayed on the periodic chart?

Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si, and Ar?

What trend in atomic radius occurs across the periodic table? what causes this trend?

If you look up the radius of the Cl atom in various online sources, you will find values ranging from 79 to 182 pm (picometers; 1pm=1×10−12 m). The most common values are 100 pm and 182 pm. What can you conclude from these data?

a. Chemists must be doing something wrong if they cannot agree on a simple number like this.

b. The 100 pm number is probably the van der Waals radius, whereas the 182 pm number is probably the bonding atomic radius.

c. The 100 pm number is probably the bonding atomic radius, whereas the 182 pm number is probably the van der Waals radius.

d. The databases are probably including Cl ions in with atoms; so the 100 pm value is probably the chlorine anion radius, whereas the 182 pm value is probably the Cl atomic radius.