CHEMISTRY

1.Name two inert gases.

Helium and Xenon （ or Neon, Argon, krypton and Radon)


2.Town gas originally has no smell. why the town gas daily used possesses a special smell

They possesses a special smell so people can notice it when there is a gas leak.


3. what is the electronic arrangement of potassium?

[Ar] 4s1


4. what is the colour of chlorine gas ?

Green


5.give one use of silicon?

Silicon Gel, used to preserve thngs.

1.
Neon, Helium.
2.
H2S or R-SH (R is CxHy) has been added.
3.
2, 8, 8, 1 (1S2, 2S2, 2P6, 3S2, 3P6, 4S1)
4.
pale, light green
5.
transistors, ICs