Atomic Size & Shielding Flashcard

Front

What is the Shielding Effect?

Back

The Shielding Effect is the phenomenon where core electrons interfere with the attractive forces between the nucleus and valence electrons, reducing the effective nuclear charge felt by the valence electrons.

Front

Which element has a larger atomic size: Fluorine (F) or Bromine (Br)?

Back

Bromine (Br) is larger than Fluorine (F) due to the addition of electron shells.

Front

What creates a Shielding Effect?

Back

Core electrons create a Shielding Effect by interfering with the attractive forces between the protons in the nucleus and the electrons in the outer shell.

Front

Which element has more shielding: Cesium (Cs) or Potassium (K)?

Back

Cesium (Cs) has more shielding than Potassium (K) because it has more electron shells.

Front

What happens to atomic radius when shielding increases?

Back

When shielding increases, the atomic radius increases due to the reduced effective nuclear charge on the valence electrons.

Front

Define atomic size.

Back

Atomic size refers to the distance from the nucleus to the outermost shell of electrons in an atom.

Front

What is effective nuclear charge?

Back

Effective nuclear charge is the net positive charge experienced by valence electrons, accounting for the shielding effect of core electrons.

Front

How does the number of electron shells affect atomic size?

Back

As the number of electron shells increases, the atomic size increases because the outermost electrons are further from the nucleus.

Front

What is the trend in atomic size down a group in the periodic table?

Back

Atomic size increases down a group due to the addition of electron shells.

Front

What is the trend in atomic size across a period in the periodic table?

Back

Atomic size decreases across a period from left to right due to increasing effective nuclear charge.