Chemical elements are substances that cannot be broken down into simpler substances by chemical means. They are the basic building blocks of matter and are the fundamental components of all known matter in the universe. Elements are characterized by the number of protons they possess in their atomic nuclei, which is referred to as the atomic number. Each element has a unique atomic number, and elements are arranged in the periodic table based on increasing atomic number.

As of my last update in September 2021, there are 118 known elements, with 94 occurring naturally on Earth and the rest being artificially synthesized in laboratories.

Elements are represented by symbols, usually one or two letters, derived from their names. These symbols serve as a shorthand notation for the elements, making it easier to write chemical formulas and reactions. The system of chemical symbols was first proposed by the Swedish chemist Jöns Jacob Berzelius in the early 19th century.

The symbols of chemical elements have some rules and conventions:

1. The first letter of the symbol is always capitalized, while any subsequent letters are written in lowercase. For example, "H" represents hydrogen, and "He" represents helium.

2. Some symbols are derived from the element's English name, such as "C" for carbon, "O" for oxygen, and "N" for nitrogen.

3. In some cases, symbols come from the element's Latin or Greek name. For instance, "Na" represents sodium (natrium in Latin) and "Fe" represents iron (ferrum in Latin).

4. Some elements have symbols based on their older names. For example, "Pb" represents lead, which comes from the Latin word "plumbum."

5. A few elements have symbols that don't directly relate to their names. For example, "K" represents potassium, which comes from the Latin word "kalium."

The use of symbols simplifies chemical equations, formulas, and communication among scientists and students in the field of chemistry. Without them, chemical names would have to be written out in full, which would be cumbersome and prone to errors. The standardization of chemical symbols enhances the clarity and efficiency of chemical communication and plays a crucial role in advancing scientific research and understanding of the natural world.

In this game, you practice remembering the chemical symbols of elements, which is useful in learning chemistry.

The game contains the 30 most common chemical elements:
-Hydrogen - H
-Helium - He
-Lithium - Li
-Carbon - C
-Nitrogen - N
-Oxygen - O
-Fluorine - F
-Neon - Ne
-Sodium - Na
-Magnesium - Mg
-Aluminium - Al
-Silicon - Si
-Phosphorus - P
-Sulfur - S
-Chlorine - Cl
-Argon - Ar
-Potassium - K
-Calcium - Ca
-Chromium - Cr
-Iron - Fe
-Nickel - Ni
-Copper - Cu
-Zinc - Zn
-Silver - Ag
-Tin - Sn
-Iodine - I
-Gold - Au
-Mercury - Hg
-Lead - Pb
-Uranium – U

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