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

Point A is located at (0, 4), and point B is located at (−2, −3). Find the x value for the point that is 1 over 4 the distance from point A to point B. −1. 5 −2

what do you think Americans thought of FDR?

Create your own scenario that shows a violation of a right listed in the Bill of Rights or another constitutional amendment.

HELP! Match the definition with the term provided. Drag each term to the correct location.

Pls solve now pls pls pls

How to tell the difference between indica and sativa.

simplify the expression :)

NO LINKS OR FILES REAL ANSWER draw a diagram of water crossing a membrane by osmosis

how to find distance between two points with latitude and longitude

Which is an equation of the line through the origin and (7,2)? O A. y = 2x OO O B. y = 7x O C. y = 54 y OD. y = )