What does "X" represent in the following symbol: ""_35^80"X" ?

2 Answers
Aug 27, 2016

Do you mean 35/80X? That should be Bromine

Explanation:

X shows the name of the element in the periodic table

Sep 4, 2016

For ""_(35)^(80) X, recall that the isotope notation uses the following symbols:

bb(""_(Z)^(A) X^(pmn))

  • Z is the atomic number, which tells you the number of protons in the element and also its identity.
  • A is the mass number, which tells you the number of protons plus the number of neutrons.
  • X is the chemical symbol of the element, and it must correspond to the atomic number.
  • pmn is the signed charge.

So, with an atomic number of 35, we look at the fourth period and seventh group/column to get "Br", or bromine. With a mass number of 80, we have the "Br"-80 isotope.