What is the energy of the lowest orbital and why?

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The lowest orbital energy is defined by the quantum mechanical model, where the ground state energy of an electron in an atom is typically negative, indicating a bound state. When an electron transitions from the second to the first orbital, it releases energy in the form of a photon, with the wavelength inversely related to the energy difference between the two states. The particle with the smallest wavelength of the emitted photon will be the one with the highest nuclear charge, which is the bipositive lithium ion. The forum emphasizes the importance of understanding concepts rather than simply providing answers, encouraging users to engage with the material. Overall, the discussion highlights the need for thorough explanations and a deeper understanding of atomic structure and photon emission.
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Help needed!

Could someone please answer the folloing questions.
Plese do give the explanations too

2- What is the energy of the lowest orbital and why?

3- If an electron makes a transition from 2nd to the first orbital than in which of the following particles will the wavelength of the photon released will be the smallest.
a) Hydrogen atom b) Deutrium atom c) Helium ion d) bipositive lithium ion.
 
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