because it is a very rare element. and any thing rare is expensive e.g gold
helium is a gas, so it doesn't really have a texture.
Helium has 2 electrons in its S shell. The most electrons that an S shell can hold is 2 so helium has a full shell, this is why it is sometimes grouped with the noble gas' as they all display full outer shells. The so called noble gas' can also be forced to react under conditions of high temperature and pressure.
Helium is 4g/mol, so 6.46g of helium is 6.46/4=1.62 moles He.
10g of helium has fewer atoms. This is because the atomic mass of helium is much higher than that of hydrogen, so the same mass of helium contains fewer atoms than the same mass of hydrogen.
If you pour liquid helium into liquid nitrogen, the helium will not mix with the nitrogen and will instead form separate layers. Helium is lighter than nitrogen and has a lower boiling point, so the helium will tend to float on top of the nitrogen.
Helium is extracted as a by-product of methane. Because the technology is difficult helium is expensive.
Because the companies that make them like money
first you have to untie the ballon then you hold with you hand so that it wont come out then you hurry up and press it on you lip nd hold it tight on your lips then breth it in then hold it then talk then slowly release the heluim then it over it will on last about 15 sec so hurry up
Helium is very dangerous. It can easily ignite in the time of fire. So hot air is more preferable than Helium. ----------------- Helium is very safe to use as it is non-flammable, however, it is far more expensive than hot air.
In theory you could fight a fire with cryogenic helium, but in reality it would be exceedingly impractical and expensive. While helium is not extremely expensive, it is quite a bit more expensive than other substances normally used to fight fires - and much less plentiful. It is very expensive to lower helium to cryogenic conditions and the equipment necessary to maintain it at cryogenic conditions is also very expensive to build and operate. Note also that because it is such a light gas, it would quickly rise away from the fire, so it would require a lot more of it to fight the fire than if something heavier were used - like water, powder, or foam.
No, Helium has 2 electrons in total, both of which occupy the first electron shell. The first electron shell can hold a maximum of 2 electrons, so Helium's electron configuration is 2.
Yes, but they are not very commonly seen so you have to call the cab companies even in Stockholm. They are quite expensive.
Both the medium and small balloon filled with helium will not hold heat well because helium is a poor conductor of heat. The amount of helium in each balloon will not significantly affect its ability to hold heat.
There are many reasons that Health Insurance is so expensive. Some reasons are the cost of prescription medicines are high, and also the Health Insurance companies need to make a profit as well.
Because the copy-cat companies want us to pay for things that look like MacBook Airs.
The design portfolio folders are expensive because the companies who manufacture them know you want your work to look good, so you'll spend money on it. Also, they are in demand. So, a lot of customers always focus on buying these types of products.The physical ones are expensive because the companies who manufacture them know you want your work to look good, so you'll spend money on it. Also, they are in demand. So, a lot of customers always focus on buying these types of products.
Dell desktops might seem relatively expensive to normal customers because they are used to prizes of other computer companies. But in fact Dell desktops are quite decently prized for medium or big companies who get discount and know about the superior quality of Dell computers.