Atomic Number

The atomic number of an element is the number of protons found in the nucleus of an atom. It is a unique identifier for each element and determines its placement on the periodic table. The atomic number is represented by the letter Z and is crucial in understanding the properties and behavior of different elements.

Key Points about Atomic Number:

• The atomic number is a whole number that is unique to each element.
• Elements are arranged on the periodic table in order of increasing atomic number.
• The number of protons in an atom is equal to its atomic number.
• Changing the number of protons in an atom would change the identity of the element.

Study Guide for Atomic Number:

1. Definition: What is the atomic number of an element?
2. Protons: How is the atomic number related to the number of protons in an atom?
3. Periodic Table: How are elements arranged on the periodic table based on their atomic number?
4. Identification: Why is the atomic number important in identifying different elements?
5. Application: Give examples of elements and their atomic numbers.

Understanding the concept of atomic number is fundamental to comprehending the organization of the periodic table and the behavior of elements in chemical reactions.