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kherson [118]
2 years ago
10

What element has three electrons in its 5d sublevel? nd nb ta u

Chemistry
2 answers:
Alex17521 [72]2 years ago
3 0
C.) Tantalum has three electrons in 5d-sublevel.
Troyanec [42]2 years ago
3 0

Answer:

Ta: tantalum

Explanation:

I list the elements, its atomic number and electronic configuration:

Nd – 60

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{4}

Nb – 41

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{3}

Ta – 73

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{3}

U – 92

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p^{6}7s^{2}5f^{4}

Then, Ta has 3 electrons in its 5d sublevel.

Use the attached image to find the electronic configuration and note that the sum of the superscripts must be equal to the atomic number

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