Properties of Matter for Elements
Radium used to be very commonly used. It was used for the bright paint on watches and, in small amounts, to treat cancer. People have deemed it "too dangerous" to use, so it is not as common anymore. When freshly prepared, radium is white, but it turns black when in contact with the air.
On the 4th of July, many people go to see fireworks shows, with fireworks of all colors, blue, red, green, etc. Where do they get those colors? The green fireworks come from Boron. Boron also helps in igniting rockets, and boric acid is used as a mild antiseptic. Boron is needed for plants, but too much of it can be toxic for humans.
Iodine is found in many different things, such as printer inks & dyes & animal feeds. The element can be found in different species of seaweed. When heated, iodine turns into a beautiful violet color.
Palladium is often used as a fake silver in outdoor situations, because it does not tarnish. It is often used to help hydrogenation and dehydrogenation reactions to occur. It was named after an asteroid, Pallas. Though it looks like silver, it is more yellow & dark than silver.
Praseodymium is used in the carbon arc for studio lights and projection. It is also used in the glass in welder's masks because it filters out the yellow light so they can see clearly. It has very low toxicity.
Astatine is an extremely rare substance to find. There are no uses for it as of now, due to its high toxicity and rarity.
1) Astatine - Unknown
2) Boron - 2466
3) Iodine - 4953
4) Radium - 5000
5) Praseodymium - 6779
6) Palladium - 11995
1) Iodine - 113.7 oC
2) Astatine - 302 oC
3) Radium - 696 oC
4) Praseodymium - 931 oC
5) Palladium - 1554.8 oC
6) Boron - 2077 oC