When was the element discovered?

Silver was written about in 900BC in India, though we do not know who discovered or when Silver. Silver has been in use as far back as 3400BC in Egyptian objects. Silver has the ability to halt bacteria and fungi growth. This is why Silver can be found in wound dressings. (Due to the fact that there is no date of discovery, I used the date since the element was in use.)

It is unsure when or who discovered Mercury, but it was in use since 1500BC by the Chinese, Egyptians and Hindus. Chinese Emperors once used Mercury in medicine to prolongate their lives but we now know that Mercury probably shortened the Emperor's life due to Mercury's toxins that may severely harm people. (Due to the fact that there is no date of discovery, I used the date since the element was in use.)

Arsenic is said to be discovered as a unique element by Geber (an alchemist) in 800BC. Geber recorded how to prepare Arsenic in "Liber Fornacum". Many accredit this discovery to Albertus Magnus who found Arsenic in 1250BC. Arsenic is utilised in modern animal feeds to stimulate growth and prevent disease.

Phosphorus was discovered in 1 by German alchemist, Henning Brand. Brand stumbled upon Phosphorus when trying the create 'the Philosopher's Stone'. Whilst experimenting with urine Brand managed to separate a white glowing material which happened to be Phosphorus. Phosphorus is part of DNA, RNA, and ATP, this means every living cell requires and has Phosphorus.

A Swedish chemist by the name of Georg Brandt, was the first person to successfully isolate Cobalt, which was done in 1735 ad. Cobalt was in use since 400 bc by the Egyptians in sculptures. Cobalt is known for the magnificent blue colour it stains glass, ceramic and glazes with. Cobalt is able to withstand enormous temperatures, it becomes solid at room temperature and doesn't melt til 1495 degrees Celsius.

Paracelsus (1500's ad) and Robert Boyle (1671 ad) had both discovered Hydrogen but hadn't followed up on their discoveries. Therefore Henry Cavendish is accredited for the discovery of Hydrogen. Henry also proved that water wasn't made up of one element, by burning the Hydrogen. Hydrogen can be found in the sun and all other stars, in fact Jupiter the planet is mostly consistent of Hydrogen. It is thought that Hydrogen is the most abundant element in universe.

Carl Wilhelm Scheele a Swedish chemist was the first person to isolate Chlorine gas and he continued to study Chlorine. Around 900 ad a Persian alchemist created a form of Chlorine called Hydrochloric acid, which combined with nitric was used to dissolve gold around 1200 ad. Despite its prior discovery Chlorine was regarded as a unique element until 1810 by Sir Humphry Davy.

Discovered by two Swedish brothers who were both chemist, Juan Jose and Fausto Elhuyar in 1783. It was discovered when the brothers were analyzing samples of the mineral wolframite. They succeeded in isolating the tungsten from wolframite by reducing the acid to charcoal. Tungsten to this day is extract using the same method the two brothers who discovered it used, from wolframite and scheelite.

Martin Heinrich Klaproth isolated the Uranium oxide in 1789 and he had mistaken it for a new element. Only in 1841 ad had the metal Uranium get isolated, which was done by Eugene-Melchior Peligot. Uranium oxide used to be used as yellow pigment in ceramic glazes in early 79 ad.

Sir Humphry Davy, Joseph Louis Gay-Lussac and Louis Jacques Thenard reacted boric acid with potassium and ended up isolating a new element, Boron which Davy originally named Boracium. Boron acid is sometimes found in volcanic spring waters, and isn't toxic to mammals.