Chlorine

Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature.

It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity on the revised Pauling scale, behind only oxygen and fluorine.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

PONDPOISE

Goldfish, koi & the calm of a well-kept pond — stocking, filtration, and care.

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