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December 20, 2014

December 20, 2014

Posted by **DrBob222** on Monday, February 5, 2007 at 9:35am.

All we have done is write the Ra isotope down and remove 2 protons (88-2=86) and 4 in mass number (2 protons + 2 neutrons = mass of 4 and 226-4=222). This forms a new element X, so what is it. We look on the periodic table and find an element with atomic number 86, then replace the X with the symbol for the element. If you don't have periodic table handy, here is one on the web.

http://www.webelements.com/

Writing subscripts and superscripts is not easy on the computer; if I have made an error I will correct it with a follow up post.

Which element results if two protons and two neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226? (I must show my workings), but i am totally lost!!!

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