Problem: Hydrogen has three isotopes (1H, 2H, and 3H), and chlorine has two isotopes (35Cl and 37Cl).Tell how many protons, neutrons, and electrons 2H35Cl contains.

FREE Expert Solution

HCl → shares 2 e- to form a covalent bond


Recall that the symbol for an element or ion is as follows:



From the periodic table:

  • Atomic number of H is 1 → number of protons, which means H has 1 proton.
  • Atomic number of Cl is 17 → number of protons, which means Cl has 17 protons.


For a neutral element the number of protons and electrons are equal (no ions formed) which means that:

  • H has 1 electron.
  • Cl has 17 electrons.
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Problem Details

Hydrogen has three isotopes (1H, 2H, and 3H), and chlorine has two isotopes (35Cl and 37Cl).

Tell how many protons, neutrons, and electrons 2H35Cl contains.

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