4/3/2023 0 Comments Metals on the periodic tableSeaborg's 1945 discovery that the actinides were in fact f-block rather than d-block elements, a recognisably modern form of the table was reached. The periodic law was recognized as a fundamental discovery in the late 19th century, and it was explained with the discovery of the atomic number and pioneering work in quantum mechanics of the early 20th century that illuminated the internal structure of the atom. Because not all elements were then known, there were gaps in his periodic table, and Mendeleev successfully used the periodic law to predict properties of some of the missing elements. The first periodic table to become generally accepted was that of the Russian chemist Dmitri Mendeleev in 1869: he formulated the periodic law as a dependence of chemical properties on atomic mass. Other atoms, like nuclides and isotopes, are graphically collected in other tables like the tables of nuclides (often called Segrè charts). The periodic table exclusively lists electrically neutral atoms that have an equal number of positively charged protons and negatively charged electrons and puts isotopes (atoms with the same number of protons but different numbers of neutrons) at the same place. The underlying reason for these trends is electron configurations of atoms. Trends run through the periodic table, with nonmetallic character (keeping their own electrons) increasing from left to right across a period, and from down to up across a group, and metallic character (surrendering electrons to other atoms) increasing in the opposite direction. Elements from the same group of the periodic table show similar chemical characteristics. The rows of the table are called periods, and the columns are called groups. The table is divided into four roughly rectangular areas called blocks. It is a graphic formulation of the periodic law, which states that the properties of the chemical elements exhibit an approximate periodic dependence on their atomic numbers. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry. Gethin: They would just melt and it would just make a mess anyway.The periodic table, also known as the periodic table of the ( chemical) elements, is a rows and columns arrangement of the chemical elements. Gethin: So, it's great for thermometers, but not so good for pots and pans. So, when it gets hot the space between the particles expands and then this rises up the thermometer. Miss Armit: Yeah, because mercury's a great conductor of heat. Gethin: Well, it's something to do with the heat. Miss Armit: It's the only liquid transistor metal and because of its properties it's perfect for a thermometer. And gold and silver are used in jewellery, because they're shiny, they're malleable and unreactive with oxygen, so they don't rust easily. We've also got iron and aluminium and they're great at conducting heat, so we use these metals for our pots and pans. Miss Armit: Well, we've got copper and it's a really good conductor of electricity, so we use that in our wires. And what metals are we talking about here and what are they used for. Miss Armit: So their key properties are they conduct electricity, they conduct heat, they are malleable - which means they're bendy - and they're shiny. So we're going to talk about transition metals, which are found in the middle of the periodic table. Gethin: I think this is going to be good, isn't it. Miss Armit: So what we're going to look at today are the metal elements in Group 1 of the periodic table, along with the metal elements in the transition metal block of the periodic table and their properties. And today, we're going to be looking at the periodic table. What she doesn't know about chemistry is not worth knowing. Gethin: Today, we've got super science teacher Miss Armit with us.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |