Answer:
Aufbau diagram of sodium ion:
2s²,2p⁶,3s¹
Answer:
The air is contained at a high pressure in the tube. When it escapes from a small orifice, it suddenly expands. A large amount of its heat is absorbed in the process of expansion resulting in considerable fall in its temperature. This is why the escaping air feels cold.
Answer:
539.19 m/s , 459.83 m/s , 2156.78 m/s
Explanation:
The formula for the rms speed is given by

Where, R be the gas constant, T be the absolute temperature and M be the molecular mass of the gas
R = 8.314 in SI units
T = 100°C = 100 + 273 = 373 K
For Oxygen:
M = 32 g = 0.032 kg

vrms = 539.19 m/s
For carbon di oxide:
M = 44 g = 0.044 kg

vrms = 459.83 m/s
For hydrogen:
M = 2 g = 0.002 kg

vrms = 2156.78 m/s