Long Form of the Periodic Table
Overview of the structure and organization of the modern long form of the periodic table.
What is Long Form of the Periodic Table?
A horizontal row in the periodic table, representing the principal energy level (n) of electrons in an atom.
Key points
- Understand the basis of the modern periodic table (atomic number).
- Identify and differentiate between groups and periods.
- Explain the significance of electronic configuration in determining properties.
- Classify elements into s, p, d, and f blocks.
Common exam trap
Confusing atomic mass with atomic number as the basis.
Definitions
- Term
Period
- Meaning
A horizontal row in the periodic table, representing the principal energy level (n) of electrons in an atom.
- Term
Group
- Meaning
A vertical column in the periodic table, characterized by similar valence electron configurations and chemical properties.
- Term
Atomic Number (Z)
- Meaning
The number of protons in the nucleus of an atom, which defines the element.
- Term
Electronic Configuration
- Meaning
The arrangement of electrons in the orbitals of an atom.
- Term
Periodic Law
- Meaning
The statement that the physical and chemical properties of elements are periodic functions of their atomic numbers.
Learning objectives
Understand the basis of the modern periodic table (atomic number).
Identify and differentiate between groups and periods.
Explain the significance of electronic configuration in determining properties.
Classify elements into s, p, d, and f blocks.
Recognize trends in properties across periods and down groups.
Prerequisites
Atomic Structure (atomic number, electronic configuration)
Basic understanding of quantum numbers
Common mistakes
Confusing atomic mass with atomic number as the basis.
Misidentifying block elements (s, p, d, f).
Incorrectly associating group number with valence electrons for p-block elements.
Forgetting the position of transition and inner transition metals.
Assuming all elements in a period have the same chemical properties.
Keywords
Periodic Table
Atomic Number
Groups
Periods
Blocks
Electronic Configuration
Periodic Law
Moseley
Transition Metals
Inner Transition Metals
Practice preview
Which block of the periodic table contains elements with their differentiating electron entering the d-orbitals?…
easy
Which of the following is a characteristic of elements in Group 17 (halogens) of the modern periodic table?…
medium
The lanthanides and actinides are placed separately at the bottom of the periodic table. These series of elements are collectively known as:…
medium