Arginine

One of the twenty protein-building amino acids.

Sodium chloride (NaCl)

Common salt (or table salt) is one of the most important sodium compounds, indispensable...

Silicon

A crystalline substance, an extremely important material in the electronics industry ...

Permanganate ion (MnO₄⁻)

Potassium permanganate is used as a disinfectant.

Glutamine

One of the 20 amino acids that make up proteins.

Valine

One of the 20 amino acids that make up proteins.

Aspartic acid

One of the twenty protein-building amino acids.

Phenylalanine

One of the 20 amino acids that make up proteins.

Leucine

One of the 20 amino acids that make up proteins.

Hungarian hussar

The term ´hussar´ refers to a type of light cavalry which originated in Hungary and was...

Silver iodide (AgI)

A light yellow compound formed in the reaction of silver nitrate and potassium iodide.

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the atmosphere, indispensable to...

Nitrogen (N₂) (basic)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Carbon monoxide (CO) (beginner)

Colourless, odourless gas, highly toxic to humans and animals in high concentration.

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