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Added MathJax syntax, fixed punctuation
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andselisk ♦
andselisk ♦
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For first four actinide elements Th$\ce{Th}$,Pa $\ce{Pa}$,U $\ce{U}$ and Np$\ce{Np}$, the difference in energy between 5f$\mathrm{5f}$ and 6d$\mathrm{6d}$ orbitals is small. Thus in elements electrons may occupy the 5f$\mathrm{5f}$ or 6d$\mathrm{6d}$ levels or sometimes both. 

Later in actinide series the 5f$\mathrm{5f}$ do become appreciable lower in energy  ,thus thus from Pa$\ce{Pa}$ onward the 5f$\mathrm{5f}$ shells fill in regular way.:-)

For first four actinide elements Th,Pa,U and Np, the difference in energy between 5f and 6d orbitals is small. Thus in elements electrons may occupy the 5f or 6d levels or sometimes both. Later in actinide series the 5f do become appreciable lower in energy  ,thus from Pa onward the 5f shells fill in regular way.:-)

For first four actinide elements $\ce{Th}$, $\ce{Pa}$, $\ce{U}$ and $\ce{Np}$, the difference in energy between $\mathrm{5f}$ and $\mathrm{6d}$ orbitals is small. Thus in elements electrons may occupy the $\mathrm{5f}$ or $\mathrm{6d}$ levels or sometimes both. 

Later in actinide series the $\mathrm{5f}$ do become appreciable lower in energy, thus from $\ce{Pa}$ onward the $\mathrm{5f}$ shells fill in regular way.

Fixed several capitalization and punctuation errors, one spelling error.
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edit approved Jan 23, 2017 at 18:27
airhuff
edit approved Jan 23, 2017 at 18:27
airhuff
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For first four actinide elements Th,Pa,U and Np, the difference in energy between 5f and 6d orbitals is small.thus Thus in elements electrons may occupy the 5f or 6d levels or sometimes both,later. Later in actinide series the 5f do become appreciable lower in energy ,thus from Pa onwardsonward the 5f shells fill in regular way.:-)

For first four actinide elements Th,Pa,U and Np the difference in energy between 5f and 6d orbitals is small.thus in elements electrons may occupy the 5f or 6d levels or sometimes both,later in actinide series the 5f do become appreciable lower in energy ,thus from Pa onwards the 5f shells fill in regular way.:-)

For first four actinide elements Th,Pa,U and Np, the difference in energy between 5f and 6d orbitals is small. Thus in elements electrons may occupy the 5f or 6d levels or sometimes both. Later in actinide series the 5f do become appreciable lower in energy ,thus from Pa onward the 5f shells fill in regular way.:-)

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Sidhant Prasad
Sidhant Prasad
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For first four actinide elements Th,Pa,U and Np the difference in energy between 5f and 6d orbitals is small.thus in elements electrons may occupy the 5f or 6d levels or sometimes both,later in actinide series the 5f do become appreciable lower in energy ,thus from Pa onwards the 5f shells fill in regular way.:-)