An atom becomes unstable if the forces acting on it are not balanced. This happens if the atom's nucleus has too much of internal energy.
They are both single cells and are used for good and bad effects
A palendromic site where the sequence is the same forwards and backwards, such as CCTAATCC,
To take a pulse, hold the wrist with only your two fingers pressed gently on the inside of the wrist. Palpate gently until you feel the pulse pulsating, and then count the number of pulse you feel for one minute. You can also do this by pressing your two fingers just under the chin bone on either side of the neck.
Here is a general standard of pulse rate (PR). Resting Pulse Rate PR < 40 BMP - Below healthy resting heart rates. PR 40-60 BPM - Resting heart rate for sleeping. PR 60-100 BPM - Healthy adult resting heart rate. PR 100 BPM - 220 BPM - Acceptable if measured during exercise. Not acceptable if resting heart rate. PR > 220 BPM - Abnormally high heart rate.