Asked Jan 27, 2020

A se atom has a mass number 78. Determine the number of neutrons, electrons and protons in this neutral isotope. 


Expert Answer

Step 1

Selenium atom:

  • In this atom, the atomic number illustrated by subscript and the mass number illustrated by superscript. Thus, the atomic number of selenium is 34 and mass number is 78.
  • The atomic number is equal to the number of protons which is equal to number of electrons in an atom.

Hence, the number of protons and electrons in Se atom is 34.

Step 2

To find number of neutrons of Selenium atom:

The mass...

Chemistry homework question answer, step 2, image 1

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