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What is the atomic number of a neutral atom with an electron configuration of 1s²2s²2p⁶3s²3p⁵4s²4p¹?

1) 21
2) 3
3) 20
4) 31

User Domonique
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1 Answer

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Final answer:

The atomic number of a neutral atom with the electron configuration 1s²2s²2p⁶6s²3p⁵4s²4p¹ is 31, which corresponds to the element Gallium (Ga).

Step-by-step explanation:

The atomic number of a neutral atom with an electron configuration of 1s²2s²2p⁶6s²3p⁵4s²4p¹ can be determined by adding up the total number of electrons, which is also equal to the number of protons for a neutral atom. The electron configuration provided corresponds to the electron configuration of the element Gallium (Ga), which has an atomic number of 31. Here is the breakdown: 1s² (2) + 2s² (2) + 2p⁶ (6) + 3s² (2) + 3p⁵ (5) + 4s² (2) + 4p¹ (1) = a total of 31 electrons, and thus Gallium has an atomic number of 31.

User Nniloc
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