Radium has 88 protons, radon has only 86 protons.
Today radium does not affect us; more important is radon.
Stronium with 31 Protons and 37 Neutrons
There are 88 protons/electrons in radium. There are 138 neutrons.
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.)
Radon occurs from alpha decay of solid radium, that is, with the loss of two protons and two neutrons alpha particles are emitted. Felsic, igneous parent bed rock such as granite can contain trace amounts of radium. It is naturally occurring.
Uranium is the most reactive.
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.
The radioactive gas radon is obtained: 226Ra-----alpha particle------222Rn
Radon has 86 protons.
Radium-226--------------------Radon-222 + alpha