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5 July, 15:40

All the actinoids, atomic number 89 through 103 have seven electron orbits.

True

False

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  1. 5 July, 15:54
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    Answer is: true.

    Actinoids are in 7 period in Periodic table and valence orbit is 7s².

    Ac - [Rn] 6d¹ 7s².

    Th - [Rn] 6d² 7s².

    Pa - [Rn] 5f² 6d¹ 7s².

    U - [Rn] 5f³ 6d¹ 7s².

    Np - [Rn] 5f⁴ 6d¹ 7s².

    Pu - [Rn] 5f⁶ 7s².

    Am - [Rn] 5f⁷ 7s².

    Cm - [Rn] 5f⁷ 6d¹ 7s².

    Bk - [Rn] 5f⁹ 7s².

    Cf - [Rn] 5f¹⁰ 7s².
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