https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz This Paddlet will contain the Date, Name of the person, and their contribution towards the development of the modern day periodic table. en-us 2022-04-05 08:19:24 UTC 2022-04-05 09:31:47 UTC hello@padlet.com https://padlet.net/icons/png/269b.png oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130271636 Empedocles didn't make a periodic table, but rather identified basic concepts of matter and force. The philosopher Empedocles named his four elements — fire, earth, air and water, which he called “roots” — for Greek gods]]> 2022-04-05 08:42:57 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130271636 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130278352 Around 330 BCE, the Greek philosopher Aristotle proposed that everything is made up of a mixture of one or more roots, an idea originally suggested by the Sicilian philosopher Empedocles. The four roots, which were later renamed as elements by the Athenium philosopher Plato, were earth, water, air and fire. ]]> 2022-04-05 08:47:39 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130278352 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130281310 One of the earliest known concept of the atom came from the Greek philosopher/scientist Democritus between 460 and 370 BCE. Democritus thought of the world as being composed of very tiny "uncuttable" particles, which he called "atomoz" or atoms. These tiny, invisible particles were thought to be separated by voids -- empty space. He explained differences in materials as caused by differences in the sizes of the particles and the amount of empty space between them. The ideas of Democritus provided a good foundation for the development of modern atomic theory.]]> 2022-04-05 08:49:43 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130281310 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130283743 After the death of Democritus, however, the great philosopher Aristotle (384-322 BCE) argued persuasively against the concept of atoms. Aristotle thought the earth was composed of matter, which he believed was made up of four elements: earth, air, fire, and water. He explained the differences in different types of matter as arising from the proportion, form, and qualities of the four basic elements that each type of matter contained.]]> 2022-04-05 08:51:28 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130283743 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130315723 The first among them was Johann Wolfgang Dobereiner, a german scientist, who in 1829 found some groups of three elements which showed similar properties. These groups were called Dobereiner's triads.]]> 2022-04-05 09:16:22 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130315723 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130322430 Another scientist that attempted to classify elements was done by British chemist John Newlands. By this time, 56 elements were discovered. He arranged all these elements in an increasing order of their atomic masses and found that every eight elements had properties similar to that of the first. He compared this to the octaves found in music and therefore, this classification was known as Newland Ocataves.]]> 2022-04-05 09:22:07 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130322430 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130327010 Dmitri Mendeleev who, in 1869, arrnged all known elements according to their checmical properties. Mandeleev arranged elements in a way that could identify thier properties. He noticed that lithiuma and sodium are very closely related in how they react. All though Mandeleeve's table is similar to our modern day table, it wasn't perfect and needed inprovment]]> 2022-04-05 09:25:33 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130327010 oparaku482727150080 https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130333074 In 1913, Henery Moseley, an English physicist discovered that atomic number is the most fundemental property of an element and not its atomic mass. This discovery changed the whole perspective of elements and their properties. And after rearranging the elements in Mandeleeve's table, our well-known modern periodic table was born.]]> 2022-04-05 09:30:29 UTC https://padlet.com/oparaku482727150080/uao2f16hkb77tmdz/wish/2130333074