Question

1. explain the trend in atomic radius. left to right its gets smaller and right to left it gets bigger 2. why do atoms get bigger as you go down the periodic table? 3. biggest atom in p.t.? fluorine (f) 4. smallest atom in p.t.? hydrogen (h)

Explanation:

1. Atomic Radius Trend:

• Across a period (left - right), protons increase, pulling electrons closer (effective nuclear charge ↑).
• Down a group, electron shells add (distance from nucleus ↑).

1. Atoms Down Group:

• New electron shells (principal quantum number \(n\) increases).

1. Biggest Atom:

• Cesium (Cs) (not Fluorine (F), as Cs has more electron shells).

1. Smallest Atom:

• Helium (He) (not Hydrogen (H), He has higher effective nuclear charge for 1 - electron shell).

Answer:

1. Across a period (left - right), atomic radius decreases (effective nuclear charge increases). Down a group, it increases (new electron shells).
2. New electron shells are added as we go down the periodic table.
3. Cesium (Cs).
4. Helium (He).