My GCSE science lessons feel like a very long time ago, and even though I haven’t ended up in a profession where I need to use much science, very occasionally I need to delve deep into my mind and try and remember what I learnt in the school chemistry labs. If you’ve ever been flummoxed by the Periodic Table or the structure of an atom, here are a few reminders…
The Periodic Table was devised by a Russian chemist called Dmitri Mendeleyev in 1869 and it houses the names of all the elements in increasing order of atomic number. The vertical columns are known as ‘groups’ and the horizontal rows are called ‘periods’. Tom Lehrer (an American musician and mathematician) came up with a great way of remembering all of the chemical elements by singing the tune of Gilbert and Sullivan’s ‘I am the Very Model of a Modern Major-General’ and replacing the words with the following:
There’s antimony, arsenic, aluminum, selenium
And hydrogen and oxygen and nitrogen and rhenium
And nickel, neodymium, neptunium, germanium
And iron, americium, ruthenium, uranium
Europium, zirconium, lutetium, vanadium
And lanthanum and osmium and astatine and radium
And gold and protactinium and indium and gallium
And iodine and thorium and thulium and thallium
There’s yttrium, ytterbium, actinium, rubidium
And boron, gadolinium, niobium, iridium
And strontium and silicon and silver and samarium
And bismuth, bromine, lithium, beryllium and barium
There’s holmium and helium and hafnium and erbium
And phosphorous and francium and fluorine and terbium
And manganese and mercury, molybdenum, magnesium
Dysprosium and scandium and cerium and caesium
And lead, praeseodymium and platinum, plutonium
Palladium, promethium, potassium, polonium
And tantalum, technetium, titanium, tellurium
And cadmium and calcium and chromium and curium
There’s sulphur, californium and fermium, berkelium
And also mendelevium, einsteinium, nobelium
And argon, krypton, neon, radon, xenon, zinc and rhodium
And chlorine, carbon, cobalt, copper, tungsten, tin and sodium.
There are the only ones of which the news has come to Harvard
And there may be many others but they haven’t been discovered.
Since the song was written a few other elements have actually been discovered. These are” lawrencium, ritherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstasium, roentgenium and seven more which still need to be named!
Atoms are the most basic units of matter and they are made up of protons, electrons and neutrons. The nucleus, which is at the heart of the atom contains the positively charged protons and the neutral neutrons. The electrons are in rings around the outside of the nucleus.
The formula for water is H20.
The reason why helium balloons float is because helium is lighter than air.
The speed of light is 299,792,458 metres per second.