https://padlet.com/3015473/thyamfmk0cxz en-us 2017-04-25 16:28:04 UTC 2025-10-05 11:11:01 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Growing.png 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168164723 Oxygen gas (dioxygen, O₂) makes up 21% of the atmosphere by volume. It is the most abundant element in the earth's crust (followed by silicon).]]> 2017-04-25 16:39:31 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168164723 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168166739 Phosphorus is a key component of biological molecules such as DNA and RNA. Phosphorus is a component of bones, and teeth, and many other compounds required for life.]]> 2017-04-25 16:45:26 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168166739 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168167616 Potassium is a metal and is the seventh most abundant and makes up about 1.5 % by weight of the earth's crust.]]> 2017-04-25 16:47:55 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168167616 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168168207 Silicon makes up 25.7% of the earth's crust by weight, and is the second most abundant element, exceeded only by oxygen.]]> 2017-04-25 16:49:24 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168168207 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168168994 Pure silver has the highest electrical and thermal conductivity of all metals, and possesses the lowest contact resistance.]]> 2017-04-25 16:51:20 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168168994 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168169883  The human diet must contain a sensible amount of sodium. ]]> 2017-04-25 16:54:25 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168169883 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168170517 Sulphur is found in meteorites, volcanoes, hot springs, and as galena, gypsum, Epsom salts, and barite. It is recovered commercially from "salt domes" along the Gulf Coast of the USA.]]> 2017-04-25 16:56:29 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168170517 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168427367 Tin resists distilled, sea, and soft tap water, but is attacked by strong acids, alkalis, and acid salts. Oxygen in solution accelerates the attack. When heated in air, tin forms SnO₂. It is, or was, used to plate steel, making "tin cans". Tin is used as one component in bell metals.]]> 2017-04-26 16:23:56 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168427367 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168427947 Uranium is surprisingly common and is more plentiful than mercury, silver, or cadmium in the earth's crust, and is about as abundant as molybdenum or arsenic.]]> 2017-04-26 16:25:39 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168427947 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168428415 Zinc-deficient animals require 50% more food to gain the same weight of an animal supplied with adequate amounts of zinc. Zinc is not particularly toxic and is an essential element in the growth of all animals and plants.]]> 2017-04-26 16:27:03 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168428415 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168428776 Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up about about 90% of the universe by weight. It is also the most abundant element in the earth's sun.]]> 2017-04-26 16:28:05 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168428776 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168429287  Iodine is an essential component of the human diet and in fact appears to be the heaviest required element in the diet. Iodine compounds are useful in medicine.]]> 2017-04-26 16:29:33 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168429287 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168429744 Iron compounds are essential to all life. For example, it is an iron atom in hemoglobin that is responsible for carrying oxygen around the blood stream.]]> 2017-04-26 16:30:55 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168429744 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168430367 Lead has no biological role. Lead affects the gut, central nervous system and causes anaemia.]]> 2017-04-26 16:32:55 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168430367 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168430734 Lithium is mixed (alloyed) with aluminium and magnesium for lightweight alloys, and is also used in batteries, some greases, some glasses, and in medicine.]]> 2017-04-26 16:34:19 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168430734 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168431416 Magnesium is an important element for plants and animals]]> 2017-04-26 16:36:27 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168431416 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168432015 Mercury only occurs rarely as the free element in nature. Overall, it is a rare element in the earth's crust. Its main source is cinnabar ore (HgS) from Spain and Italy. The Alma den mine in Spain has been in continuous operation since 400 BC. Other sources include Yugoslavia, Russia, and North America.]]> 2017-04-26 16:38:10 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168432015 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168432523 Neon gas is present in the atmosphere at about 1 part in 65 000.]]> 2017-04-26 16:39:45 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168432523 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168433268 Nickel is an essential trace element for many species. Chicks and rats raised on nickel-deficient diets have liver problems. Enzymes known as hydrogenases in bacteria contain nickel. Nickel is also important in plant ureases.]]> 2017-04-26 16:42:07 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168433268 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168433767 Nitrogen is a key component of biological molecules such as proteins (which are made from amino acids, and nucleic acids. The nitrogen cycle in nature is very important.

]]> 2017-04-26 16:43:36 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168433767 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168434470 Aluminium metal is not found as the free element, however, aluminium is an abundant element in the earth's crust. The most important ore is bauxite.]]> 2017-04-26 16:45:37 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168434470 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168434906 Bromine may be an essential trace element for red algae and possibly mammals. It is found in the mollusc pigment "royal purple", although its role is not understood. Excessive bromide intake leads to depression and of weight loss.]]> 2017-04-26 16:46:50 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168434906 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168437583 Calcium is essential for all life. It forms part of cell walls and bones. It is important for blood clotting.]]> 2017-04-26 16:54:28 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168437583 3015473 https://padlet.com/3015473/thyamfmk0cxz/wish/168438065 Carbon is key to life and by definition is present in all organic compounds. The study of life is known as biological chemistry or biochemistry. Ethene gas (C₂H₄) helps to ripen tomatoes.]]> 2017-04-26 16:55:51 UTC https://padlet.com/3015473/thyamfmk0cxz/wish/168438065