Question #bc45b

1 Answer
May 2, 2017

Answer:

#""_82^211"Pb" → ""_83^211"Bi" + ""_text(-1)^0"e"#

Explanation:

It's difficult to read your question. I assume that you want to balance an equation like this:

#""_82^211"Pb" → ""_83^211"Bi" + ""_text(?)^??#

The main things to remember are:

  • The sum of the subscripts must be the same on each side of the equation.
  • The sum of the superscripts must be the same on each side of the equation.

Subscripts

#82 = 83 + ?#
#? = "82 - 83" = "-1"#

This gives

#""_82^211"Pb" → ""_83^211"Bi" + ""_text(-1)^??#

Superscripts

#211 = 211 + ?#
#? = "211 - 211" = 0#

This gives

#""_82^211"Pb" → ""_83^211"Bi" + ""_text(-1)^0?#

Identify the particle

What particle has a charge of -1 and a mass near zero? An electron (or beta particle)!

The complete equation becomes

#""_82^211"Pb" → ""_83^211"Bi" + ""_text(-1)^0"e"#