Radium has 88 protons, radon has only 86 protons.
There are 88 protons/electrons in radium. There are 138 neutrons.
Today radium does not affect us; more important is radon.
The isotope with 86 protons and 136 neutrons is radium-222.
Radium is more reactive than radon. Radium is a highly reactive metal that readily forms compounds, while radon is a noble gas and is less reactive due to its stable electron configuration.
When Radium-226 decays to form Radon-222, the Radium nucleus emits an alpha particle. The atomic number goes down by 2, and the mass number goes down by 4, matching the atomic number and mass number of the alpha particle.
When radium-226 decays to form radon-222, the radium nucleus emits a alpha particle.
Fortunately we haven't radium in our houses (but we have radon !).
Radium has 88 protons.
Radium has 88 protons.
Radon has 86 protons.
The radioactive gas radon is obtained: 226Ra-----alpha particle------222Rn
The neutrons aren't really relevant, since we don't know what the mass of the radium nucleus was and the element is determined strictly by the number of protons anyway. Radium has an atomic number of 88; losing 4 protons would make the atomic number 84, which is polonium. (This is probably really a two-step process: radium -> radon -> polonium, where each step is an alpha decay.)