436
218
318
109average:= (28 + 190)/2= 218/2= 109
Well, let's take a moment to appreciate the number 218. When we round it to the nearest ten, we look at the digit in the tens place, which is 1. Since 1 is less than 5, we keep the tens digit the same and change the rest to zero. So, 218 rounded to the nearest ten is 220. Just a happy little rounding adjustment to make our number feel just right.
109
The number 218 in polonium-218 represents the total number of nucleons (protons and neutrons) in the nucleus of that specific isotope of polonium. It refers to the sum of protons and neutrons in the atomic nucleus of the polonium-218 atom.
Polonium-218 is radioactive.
Polonium-218 decay to lead-214.
The beta minus decay of polonium isotopes is extremely rare. Beta decay involve the increase of the atomic number with 1.Example: Po-218----------------beta minus---------------At-218
Polonium-218 undergoes alpha decay to form lead-214, which then undergoes beta decay to form bismuth-214.
Polonium 210-----------alpha particles-----------Lead 206 Polonium 209-----------alpha particles-----------Lead 205 Polonium 208-----------alpha particles-----------Lead 204 Polonium 214-----------alpha particles-----------Lead 210 Polonium 218-----------alpha particles-----------Lead 214 (99,98 %) Polonium 218-----------beta particles------------Astatin 218 (o,o2 %) For other isotopes see the list at: http://en.wikipedia.org/wiki/Polonium#Isotopes
When astatine-218 undergoes alpha decay, it emits a helium nucleus (alpha particle) and transforms into the new element, polonium-214. This process reduces the atomic number of the nucleus by 2 and the mass number by 4.
The nucleus of a polonium-218 atom contains 84 protons and 134 neutrons, while the nucleus of a radon-222 atom contains 86 protons and 136 neutrons. This difference in the number of protons and neutrons results in different nuclear properties and stability for each atom.
Polonium is a metal element. Atomic mass of it is 209.
Polonium has 84 protons.
Polonium-210 has 126 neutrons.
Polonium has the atomic number 84 in the periodic table.