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lisov135 [29]
3 years ago
15

Using the periodic table, choose the more reactive nonmetal. At or Br

Chemistry
2 answers:
Alona [7]3 years ago
7 0

Explanation:

Reactivity of non-metals depend on their ability to gain electrons. So, smaller is the size of a non-metal more readily it will attract electrons because then nucleus will be more closer to valence shell.

Hence, both bromine (Br) and astatine (At) belongs to same group. Size of bromine is smaller than the size of astatine.

Hence, Br is the non-metal which will be more reactive than At.

Veronika [31]3 years ago
3 0
The answe would be at

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<u>Answer:</u> The isotopic symbol of barium is _{56}^{138}\textrm{Ba} and that of strontium is _{38}^{89}\textrm{Sr}

<u>Explanation:</u>

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^{235}_{92}\textrm{U}+^1_0\textrm{n}\rightarrow ^A_Z\textrm{Ba}+^{94}_{36}\textrm{Kr}+3^1_0\textrm{n}

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^{235}_{92}\textrm{U}+^1_0\textrm{n}\rightarrow ^A_Z\textrm{Sr}+^{143}_{54}\textrm{Xe}+3^1_0\textrm{n}

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Total mass on reactant side = total mass on product side

235 + 1 = A + 143 + 3

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Total atomic number on reactant side = total atomic number on product side

92 + 0 = Z + 54 + 0

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Hence, the isotopic symbol of barium is _{56}^{138}\textrm{Ba} and that of strontium is _{38}^{89}\textrm{Sr}

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