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What is the mass number of the element?

Physics

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Answer

2

24\text{24}

8\text{8}

Step-by-step solution

5 steps

Part 1· 3 steps

Ili kupata namba ya masi (mass number) ya elementi, tunahitaji kujua idadi ya protoni na idadi ya neutroni.

  1. Tafuta idadi ya elektroni kutoka kwenye mchoro.

    Kwenye ganda la kwanza (ndani kabisa) kuna elektroni 2.
    Kwenye ganda la pili kuna elektroni 8.
    Kwenye ganda la tatu (nje kabisa) kuna elektroni 2.
    Jumla ya elektroni = 2+8+2=122 + 8 + 2 = 12 elektroni.

  2. Tafuta idadi ya protoni.

    Kwa atomi isiyo na chaji (neutral atom), idadi ya elektroni ni sawa na idadi ya protoni.
    Hivyo, idadi ya protoni = 12.

  3. Kokotoa namba ya masi.

    Namba ya masi (Mass Number) = Idadi ya protoni + Idadi ya neutroni.
    Kutoka kwenye swali, idadi ya neutroni = 12.

    Namba ya Masi=12 (protoni)+12 (neutroni)=24\text{Namba ya Masi} = 12 \text{ (protoni)} + 12 \text{ (neutroni)} = 24

    Jibu sahihi ni B.

Part 2

24\text{24}

Neon (Ne) ni elementi yenye namba atomiki 10. Hii inamaanisha ina protoni 10 na elektroni 10.

  1. Panga elektroni katika maganda yake.

    Ganda la kwanza linaweza kushikilia elektroni 2.
    Ganda la pili linaweza kushikilia elektroni 8.
    Kwa elektroni 10 za Neon, mpangilio utakuwa 2 (ganda la kwanza), 8 (ganda la pili).

  2. Tambua idadi ya elektroni kwenye ganda la nje.

    Kutokana na mpangilio wa elektroni (2, 8), ganda la nje lina elektroni 8.
    Jibu sahihi ni B.

    1. B. 24\boxed{\text{24}}
    2. B. 8\boxed{\text{8}}
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