They have less or more neutrons. Isotopes have same number of protons but different number of neutrons.
<span>Which of the following is an electronic device that measures pH?
</span><span>a. a pH meter</span>
Answer:
The highly unstable pure sodium or potassium wants to lose an electron and this splits the water atom, producing a negatively charged hydroxide ion and hydrogen and forming an explosive gas that ignites.
Explanation: