account for around 20% of known elements close element A pure substance which is made from only one type of atom. Non-metal elements are on the right hand side of the periodic table. are metals, while non-metals close non-metal A substance that has the typical properties of a non-metal. It allows us to spot patterns and make predictions about other elements. Most elements in the periodic table close periodic table A table which lists all of the chemical elements and arranges them in a way that is useful. Gethin: They would just melt and it would just make a mess anyway. 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. And the farther they are from the righ side of the table, the weaker their electronegativity is, resulting in lower Chemical Reactivity.Gethin: Today, we've got super science teacher Miss Armit with us. That is why as you go up a group Chemical Reactivity increases because it is easier for elements to gain electrons when they have high electronegativity. Chemical Reactivity decrease as you go down the groupįor Non-Metals, the farther right-up in the table you go, the higher the electronegativity.Chemical Reactivity increases as you go left to right of the periodic table.And you go from left to right on the periodic table elements have more electrons in their valence shells they have to get rid off which requires an element to have high energies which results into lower Chemical Reactivity. This happens because as you go down a group, it is easier for electrons to be taken or given away, resulting in high Chemical Reactivity. Chemical Reactivity increases as you go down the group.Chemical Reactivity decrease as you go left to right of the periodic table.Īnother factor is the Electronegativity of the element, which determine how badly an element wants to take other electrons from other elements. One factor is Ionization Energy, Ionization Energy is how easily and element can remove its electrons. A couple factors will determine how likely and element will react to another element.
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