✨URGENT✨
Helium has a structure 1s2. The electron is being removed from the same orbital as in hydrogen's case. It is close to the nucleus and unscreened. The value of the ionization energy (2370 kJ mol-1) is much higher than hydrogen, because the nucleus now has 2 protons attracting the electrons instead of 1.
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Answer:
Helium is the eighteenth group in the periodic table. We know that all the elements in the eighteenth group are noble gases. So, Helium is comes in the category of noble gas. Helium does not react with other chemicals because Helium gas is the noble gas. Helium is in second period in the periodic table. The chemical symbol of Helium is "He". The atomic number of Helium is 2. Helium is lighter than air. So, people uses Helium gas to inflat balloons. It is used in mobile phones, computer and tablet chips. It is used in high speed internet and cable TV. It is used in cleaning rocket fuel tanks. It has low boiling point, low density, low solubility and high thermal conductivity. Helium is found in our atmosphere with very low quantity is 0.0005%. It has one energy shell in it's atom. It has two electrons present in it's shell. Helium is much lighter than all the elements present in the periodic table.