Atoms and The Periodic Table

Sections

Navigate through the learning materials and practice exercises.

1. 1

   The Structure Of The Atom

   Learn Practice

   This section discusses the fundamental components of atoms, including...

2. 1.1

   Atomic Number And Mass Number

   Learn Practice

   This section discusses the atomic number, mass number, and isotopes,...

3. 1.2

   Isotopes

   Learn Practice

   Isotopes are variants of elements that share the same atomic number but...

4. 1.3

   Electron Configuration

   Learn Practice

   Electron configuration describes how electrons are arranged in an atom's...

5. 2

   The Development Of The Periodic Table

   Learn Practice

   The development of the periodic table includes significant milestones,...

6. 2.1

   Dmitri Mendeleev (1869)

   Learn Practice

   Dmitri Mendeleev is known for creating the first periodic table by arranging...

7. 2.2

   Henry Moseley (1913)

   Learn Practice

   Henry Moseley's work in 1913 led to the modern arrangement of the periodic...

8. 2.3

   Modern Periodic Table

   Learn Practice

   The Modern Periodic Table organizes elements based on atomic number and...

9. 3

   The Organization Of The Periodic Table

   Learn Practice

   The periodic table organizes 118 elements into periods and groups based on...

10. 3.1

    Periods

    Learn Practice

    This section explains the concept of periods in the periodic table,...

11. 3.2

    Groups

    Learn Practice

    Groups in the periodic table refer to vertical columns where elements share...

12. 3.2.1

    Group 1: Alkali Metals

    Learn Practice

    Group 1, known as alkali metals, includes highly reactive elements with one...

13. 3.2.2

    Group 2: Alkaline Earth Metals

    Learn Practice

    Group 2 comprises alkaline earth metals, which have two electrons in their...

14. 3.2.3

    Group 17: Halogens

    Learn Practice

    Group 17, known as halogens, consists of highly reactive non-metals with...

15. 3.2.4

    Group 18: Noble Gases

    Learn Practice

    Noble gases, found in Group 18 of the periodic table, are known for their...

16. 3.3

    Transition Elements

    Learn Practice

    Transition elements are the metals located in Groups 3-12 of the periodic...

17. 4

    Trends In The Periodic Table

    Learn Practice

    This section outlines the significant trends observed in the periodic table,...

18. 4.1

    Atomic Radius

    Learn Practice

    The atomic radius refers to the size of an atom, which varies with its...

19. 4.2

    Ionization Energy

    Learn Practice

    Ionization energy refers to the energy required to remove an electron from...

20. 4.3

    Electronegativity

    Learn Practice

    Electronegativity refers to the ability of an atom to attract electrons in a...

21. 4.4

    Reactivity

    Learn Practice

    Reactivity describes how readily an element undergoes chemical reactions,...

22. 5

    The Significance Of The Periodic Table

    Learn Practice

    The periodic table is a predictive model that organizes elements and reveals...