Shanae771 Shanae771
  • 05-06-2015
  • Chemistry
contestada

What is the total number of protons in the nucleus of an atom of potassium-42?
(1) 15 (3) 39
(2) 19 (4) 42

Respuesta :

stephenlee0912 stephenlee0912
  • 05-06-2015
The answer is (2) 19. The number of protons of any isotope of a given element is just its atomic number (because the number of protons identifies the element). Potassium's atomic number is 19.
Answer Link

Otras preguntas

write any two rules of hockey​
3. a stone thrown up is caught by the thrower after 6 seconds how high did it go and where was it 4 seconds after start (g = 9.8m/s2)??​
At 6 AM the temperature read -17 F by noon it had risen by 23 F. Find the new temperature
How many protons are in an element with an atomic number of 8 anda mass number of 18? 3 8 10 18
Article 4 outlines interstate relationships which of the following would be an example pf this concept?
Solve the following equation for x. −13−4x−13x=−14+15x
Deduce the firstequation of motion matematical method​
What are the properties of a concave mirror
How to convert chlorophenylamine to bromochlorobenzene
a films production sound mixer is responsible for holding the microphones out of the way of the actors and the cameras