The number of electrons in the atom is The number of electrons in the atom is answer choices Each separated letter in that notation represents a distinct electron orbital. To use electron affinities properly, it is essential to keep track of sign. An atom of Chlorine in the gas phase, for example, gives off energy when it gains an electron to form an ion of Chlorine. The electron configuration of an atom is 1s 2 2s 2 2p 6. The electron configuration of a neutral Chlorine atom is 1s^2 2s^2 2p^6 3s^2 3p^5, or [Ne]3s^2 3p^5 for short. Therefore, there are 5 electron orbitals in chlorine. Valency of an element is the tendency of the element to accept or lose electrons in order to complete its octet to get stability. When an electron is added to a neutral atom, energy is released. The electron configuration of chlorine is 1s2 2s2 2p6 3s2 3p5. However if you are asking about the ION, so you have to consider the charge.
Cl + e – → Cl – – ∆H = Affinity = 349 kJ/mol. The electron configuration for chlorine is 1s2 2s2 2p6 3s2 3p5 or [Ne] 3s2 3p5 in shorter notation.
Electron configuration was first conceived under the Bohr model of the atom, and it is still common to speak of shells and subshells despite the advances in understanding of the quantum-mechanical nature of electrons.. An electron shell is the set of allowed states that share the same principal quantum number, n (the number before the letter in the orbital label), that electrons may occupy.
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