Systemic scleroderma (systemic sclerosis) - blood vessels and internal organs are also affected (as well as the skin). The patient may experience fatigue (tiredness), weight loss and muscle pains. A risk factor is something which increases the likelihood of developing a condition or disease.
The Atomic number of Carbon is 6. The Atomic mass of Carbon depends on the isotope and may be from 8 to 22. Carbon 12 and Carbon 13 are the only stable isotopes of Carbon. Carâ¦bon 14 is the longest-lived unstable (radioactive) isotope. Only Carbon 12, 13 and 14 are found in nature.
Carbon-12; 6 neutrons. The symbols for the isotopes of carbon atoms shown here indicate they each have six protons but mass numbers of 14, 13 and 12. These isotopes are not equally abundant. Carbon-12 (C-12) makes up 98.9 % of all carbon atoms while carbon-13 (C-13) makes up 1.1 %.n example of this is shown with the three different isotopes of carbon. Here they all have 6 protons, but different numbers of neutrons. Carbon-14 has 8 neutrons. Carbon-13 has 7 neutrons and carbon-12 has 6 neutrons.