Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Elements are represented by unique symbols approved by IUPAC (International Union of Pure and Applied Chemistry).
The first letter of a symbol is always a capital letter and the second letter (if present) is always a small letter. For example, Hydrogen is represented as and Aluminum as .
Symbols can be derived from the first letter of the element's English name (e.g., Oxygen is ) or the first two letters (e.g., Helium is ).
Certain symbols are derived from the Latin, Greek, or German names of the elements. For example, Iron is from Ferrum, Sodium is from Natrium, and Potassium is from Kalium.
The notation for an atom includes its chemical symbol, its atomic number (), and its mass number ().
The symbol of an element represents one atom of that element and also represents a definite mass of the element (molar mass).
📐Formulae
💡Examples
Problem 1:
Explain why the symbol for Copper is and not .
Solution:
The symbol is already assigned to Carbon. Copper derives its symbol from its Latin name Cuprum, resulting in .
Explanation:
To avoid confusion between elements starting with the same letter, IUPAC uses either a second letter from the English name or the Latin name. Carbon is , Calcium is , and Copper is .
Problem 2:
Represent an atom of Aluminum which has protons and neutrons using the notation.
Solution:
Explanation:
The atomic number is the number of protons (). The mass number is the sum of protons and neutrons (). The symbol for Aluminum is . Placing these in the standard format gives .
Problem 3:
Identify the elements represented by the following symbols: .
Solution:
Explanation:
These symbols are derived from Latin names: Plumbum (), Aurum (), Argentum (), and Hydrargyrum ().