The isotope 18O is only a minor natural isotope: 0,0201 %.
The most common isotope of carbon is carbon-12.The most common isotope of carbon is carbon-12.The most common isotope of carbon is carbon-12.The most common isotope of carbon is carbon-12.
The most common plutonium isotope is plutonium 239.
The most common isotope of selenium is selenium-80, which makes up about 50% of naturally occurring selenium.
Ar 40 is the most common isotope, accounting for 99.6% of the total (by weight).
The mass number of the most common titanium isotope is 48.
The most common isotope of silicon is the isotope 28Si: 92,23 %.
Vanadium-51 is the most common isotope.
The most common isotope of carbon is carbon-12.The most common isotope of carbon is carbon-12.The most common isotope of carbon is carbon-12.The most common isotope of carbon is carbon-12.
The most common natural isotope is 238U: 99,2742 %.
The most common plutonium isotope is plutonium 239.
The most common isotope of selenium is selenium-80, which makes up about 50% of naturally occurring selenium.
The mass number of the most common titanium isotope is 48.
Ar 40 is the most common isotope, accounting for 99.6% of the total (by weight).
BORON 511 atomic#=5, atomic mass = 11 (for most common isotope)
The most common plutonium isotope is plutonium 239.
Each (unstable) isotope has a distinctive half-life.
The most common isotope is einsteinium-253. So atomic mass is 253 for the most common isotope