![]() ![]() Gethin: So, the further down the table you go the more reactive they become. So, the reason we didn't see the reactions of those last three metals is that they are so reactive the explosion would be far too big. Miss Armit: No, it's the second rarest element on Earth. That's not an element that you hear a lot of. ![]() We saw there lithium, then sodium and then potassium, but you didn't see rubidium, caesium and francium. Key fact They must be stored under oil to prevent them reacting with the air or water vapour. As you can see the metal's get increasingly more reactive as you go down this group. Gethin: It's fair to say that you love the Group 1 metals, don't you. Well, sodium is below lithium in group one and the reactivity of the alkali metals increases as you go down the group, so potassium is even more reactive. So let's try it with another Group 1 metal - sodium.Īs you can see it reacts far more vigorously then lithium. And can you see the little purple trail there? That universal indicator is showing us that the water now contains an alkali in this case - lithium hydroxide. It's transferring its energy to its surroundings by heating. Well, you can see it's reacting with the water straight away - it's steadily fizzing away there. And if I put some universal indicator in, like this, you'll see that it's green and that means it's neutral.īut let's see what happens when we put the lithium in. For example, it is commonly asserted that the reactivity of alkali metals (Na, K, etc.) increases down the group in the periodic table, or that hydrogens reactivity is evidenced by its reaction with oxygen. And do you see how quickly it tarnishes, how quickly it's changing colour? Here we've got some water. Here I've got some lithium and I'm just going to cut a little bit off. When a Group 1 element reacts with water it produces a metal hydroxides solution and hydrogen gas. As we move from left to right, the electropositive character decreases, and the electronegative character increases. They're soft and shiny when freshly cut, but they quickly tarnish as the metal reacts with oxygen in the air. Im assuming youre asking about how the CHARACTER changes as we move all about the periodic table, and based on that how does the reactivity change. ![]() Let's take a look at some Group 1 metals then - also known as alkaline metals.įran: Group 1 elements are called the alkali metals. Gethin: And today we're going to be looking at the periodic table. ![]()
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