Question

Question #bc45b

Answer 1

`""_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"`