Learning Module 15: A First Look at Periodic Trends Based on ENC

These flashcards cover key concepts related to periodic trends based on effective nuclear charge (ENC) from the lecture notes.

Atomic Radius

The radius of a neutral atom, used to measure an atom's size.

Effective Nuclear Charge (ENC)

The net positive charge experienced by electrons in an atom, influencing atomic size and electron affinity.

Ionic Radius

The radius of an ion, which can differ from that of its neutral atom due to electron loss or gain.

Isoelectronic Species

Atoms or ions that have the same number of electrons and thus the same electronic configuration.

Electronegativity (EN)

The tendency of an atom to attract a bonding pair of electrons, important in determining bond types.

Coulombic Attraction

The attractive force between positively charged protons and negatively charged electrons, influencing atomic and ionic radii.

Metallic Character

A measure of an element's ability to lose electrons and form positive ions, typically increases down a group and decreases across a period.

Trends Up and to the Right

A pattern in the periodic table where atomic radius decreases, electronegativity increases, and metallic character decreases.