Question

question 28 (1 point)listenrank the following atoms in order of increasing atomic radius (i.e., lowest to highest):cesium (cs)silicon (si)calcium (ca)argon (ar)question 29 (1 point)listenrank the following atoms in order of decreasing atomic radius (i.e., highest to lowest):neon (ne)boron (b)barium (ba)magnesium (mg)

Explanation:

For atomic radius trends: Across a period (left to right), atomic radius decreases as nuclear charge increases, pulling electrons closer. Down a group (top to bottom), atomic radius increases as new electron shells are added.

Question 28:

• Argon (Ar) is a noble gas in period 3, group 18 (smallest here).
• Silicon (Si) is in period 3, group 14 (larger than Ar, smaller than Ca).
• Calcium (Ca) is in period 4, group 2 (larger than Si, smaller than Cs).
• Cesium (Cs) is in period 6, group 1 (largest here).

Question 29:

• Barium (Ba) is in period 6, group 2 (largest here).
• Magnesium (Mg) is in period 3, group 2 (smaller than Ba, larger than B).
• Boron (B) is in period 2, group 13 (smaller than Mg, larger than Ne).
• Neon (Ne) is a noble gas in period 2, group 18 (smallest here).

Answer:

Question 28 (increasing atomic radius, lowest to highest):

1. Argon (Ar)
2. Silicon (Si)
3. Calcium (Ca)
4. Cesium (Cs)

Question 29 (decreasing atomic radius, highest to lowest):

1. Barium (Ba)
2. Magnesium (Mg)
3. Boron (B)
4. Neon (Ne)