We will learn more about this in Gr. Chromium is a metal.Can you find chromium on the Periodic Table? They need to be strong so that they do not break and last a long time. You will notice that there are no empty blocks in the modern version of the table. When Mendeleev first created the Periodic Table, he arranged the 60 elements that he knew of at the time in order of increasing mass. For example, metals are durable, malleable and shiny so they are suitable for making jewellery, pots and pans and motor car parts.Let's look at some more examples. Mendeleev then grouped them into columns and rows according to their properties. They create a file about element X. The 2p, 3d, or 4f shells have no radial nodes and are smaller than expected. When is data 'the truth'? It briefly explains what an element is, introduces Dmitri Mendeleev and his arrangement of the Periodic Table and also explains some of the concepts discussed later on in the chapter.People have been interested in science from the earliest times. While other scientists made many contributions to the design of the Periodic Table, Mendeleev was the one who first showed that the table could predict the existence and properties of elements that were still undiscovered at the time.An interesting video that tells us about how scientists solved the puzzle of the Periodic Table.This video tells us more about how Dmitri Mendeleev listed and arranged the elements on the Periodic Table and why this was such an important event in the history of science as we know it.Mendeleev's original table is not part of what learners are required know, but has been included to give learners a sense of the pace of scientific discovery. For now, the emphasis is on the main distinctions between metals and non-metals, and then also semi-metals.How would you describe the elements that are mostly on the left side of the Periodic Table? Did you know that the position of an element on the Periodic Table can tell a scientist what properties the element can be expected to have? [2 marks] Hydrogen, H.Extension question: What does the atomic number of hydrogen tell us about it? They began to observe patterns and similarities in the way some groups of elements behaved and recorded these observations. What are these? This provides you with an astonishing display of your favorite elements at a lower cost. Now you can also colour hydrogen (H) red. This is useful when making the coin shape and also creating the pattern on the faces.Why do you think we make jewellery out of the metals gold, silver and platinum, and not for example out of a non-metal such as sulfur? Try to do this without referring to the Periodic Table.AlMgBromineNCalciumOxygenCPhosphorusClKCopperSiAuSilverHNaIodineSulfurFeTinLeadZnAluminiumAlMagnesiumMgBromineBrNitrogenNCalciumCaOxygenOCarbonCPhosphorusPChlorineClPotassiumKCopperCuSiliconSiGoldAuSilverAgHydrogenHSodiumNaIodineISulfurSIronFeTinSnLeadPbZincZnThe Periodic Table is made up of 103 elements, but only 90 of the elements occur in nature. The early transition metals zirconium and hafnium (probably also rutherfordium) in group 4, as well as niobium and tantalum (probably also dubnium) in group 5, also display such behaviour. See if you can find out the name of this element and write it down below.
If you are able to use actual real samples, learners might also note that these elements are not as hard and durable as the metals, for example you can show learners how the graphite is brittle, or show them the various powder forms of these elements.
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