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vovikov84 [41]
3 years ago
9

In the symbol (4/2)He, the superscript 4 is the for helium, and the subscript 2 is the for helium.

Chemistry
2 answers:
AleksandrR [38]3 years ago
5 0
The superscript 4<span> is the atomic mass for </span>helium, and the subscript 2<span> is the atomic number for </span>helium<span>.
I hope that will help you.Let me know if need more help on this</span>
VLD [36.1K]3 years ago
4 0

the given symbol is

⁴₂He

subscript for the element is the atomic number of the element

atomic number is the number of protons . atomic number is characteristic for the element

superscript is the mass number. mass number is the sum of protons and neutrons. mass number means the atomic mass.

therefore atomic number is 2 and mass number is 4

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2 years ago
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6 0
3 years ago
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What is the pH of a solution that has a pOH of 5.9
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6 0
2 years ago
Consider the reaction 2 al + Fe2O3 to 2Fe + Al2O3. If 60.0g of Al is reacted with excess Fe2O3, determine the amount (in moles)
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    <em><u>calculation</u></em>

     2 Al  + Fe2O3 → 2Fe  + Al2O3

    step  1: find the moles of Al  by  use of <u><em>moles= mass/molar  mass  </em></u>formula

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    Step 2: use the mole ratio to determine the  moles of Al2O3.

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Step 3:    finds the mass  of  Al2O3  by us of  <u><em>mass= moles x molar mass</em></u><em> </em>formula.

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7 0
2 years ago
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