Periodic Trends in Properties

Name: Periodic Trends in Properties
Author: StemPy Lab

How the size of atoms and ions, the ionisation enthalpy, the electron gain enthalpy and the electronegativity change across a period and down a group, and how they decide valence and reactivity.

3 lessons, about 1 h 25 min3 simulations11 problems5 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
Atomic and ionic radii
Atoms get smaller across a period and larger down a group. A cation is smaller than its atom, and an anion larger. In a set of isoelectronic species, the one with the most protons is the smallest. The covalent radius is half the distance between two bonded nuclei.
1 simulation2 practice questions1 Python program4 problems1 Python lab
Read the lesson
Lesson 2about 30 min
Ionisation enthalpy and electron gain enthalpy
Ionisation enthalpy is the energy to remove the outermost electron from a gaseous atom. It rises across a period, with dips at groups 13 and 16, and falls down a group. Electron gain enthalpy is the enthalpy change when a gaseous atom takes an electron, most negative for the halogens.
1 simulation2 practice questions1 Python program4 problems1 Python lab
Read the lesson
Lesson 3about 25 min
Electronegativity, valence and reactivity
Electronegativity measures how strongly an atom in a molecule pulls a shared pair of electrons. It rises across a period and falls down a group. The trends explain valence, the unusual second period, the diagonal relationship, chemical reactivity and why oxides change from basic to acidic across a period.
1 simulation1 practice question1 Python program3 problems1 question set1 note
Read the lesson

Test Your Learning

Periodic Trends: NEET Style Test

20 questions · 25 min

Not started

Your teacher

StemPy Lab

← All Courses

← Building the Periodic TableNext →

More onThe Periodic Table › Periodic Trends The Periodic Table › Groups and Families

Discussion (0)

Loading…

Periodic Trends in Properties

Course outline (3 lessons)

Atomic and ionic radii

Ionisation enthalpy and electron gain enthalpy

Electronegativity, valence and reactivity

Test Your Learning

Your teacher

Discussion (0)