Question

1. click the attribute, \atomic radius\ to color - code the elements for this property.
2. analyze the tuva data set.

select the correct statement(s) about atomic radius.
the atomic radius increases as you move down a group.
the atomic radius increases as you move across a period.
the atomic radii from largest to smallest are barium (ba), calcium (ca), bromine (br), and fluorine (f).
the atomic radii from largest to smallest are fluorine (f), bromine (br), calcium (ca), and barium (ba).
the atomic radius decreases as you move down a group.
the atomic radius decreases as you move across a period.

Explanation:

• For the trend down a group: As you move down a group in the periodic table, new electron shells are added. Each new shell is farther from the nucleus, so the atomic radius increases.
• For the trend across a period: As you move across a period, the number of protons in the nucleus increases (nuclear charge increases). The electrons are added to the same shell. The increased nuclear charge pulls the electrons closer to the nucleus, so the atomic radius decreases.
• For the order of atomic radii: Barium (Ba) is in period 6, calcium (Ca) is in period 4. Bromine (Br) is in period 4 (but to the right of Ca in the period) and fluorine (F) is in period 2. Since atomic radius increases down a group and decreases across a period, the order from largest to smallest is Ba > Ca > Br > F.

Answer:

• The atomic radius increases as you move down a group.
• The atomic radii from largest to smallest are barium (Ba), calcium (Ca), bromine (Br), and fluorine (F).
• The atomic radius decreases as you move across a period.