memecurll memecurll

03-06-2018
Physics

contestada

How many neutrons does element X have if its atomic number is 31 and its mass number is 90?

Respuesta :

Porshia Porshia

03-06-2018

Things you need to know:
Atomic number= protons,
Protons + neutrons= mass number.
This means 31 + x = 90
Subtract 31 from both sides and you get x= 59
Answer is 59 neutrons

Answer Link

Otras preguntas

The first life on Earth is commonly beleived to have originated 3.5 BYA (billion years ago), yet the rise of atmospheric Oxygen didn't take place until almost a

Philippe wants to measure how much water his potted tomato plants lose through transpiration each day. To do this, he sets up a series of experiments to capture

how were the original 13 colonies ruled

Which of these is the correct word equation for the reaction, 2C4H10 (g) + 1302 (g) —> 8CO2 (g) + 10H2O (g)? A) Water vapor and carbon dioxide gas react to f

Please explain thoroughly. Why do so many earthquakes occur along the west coast of the united states? Explain using continental drift and seafloor spreading.

Help me!!! I am so confused

In a Right Triangle, with a hypotenuse of 15cm and opposite side of 12cm. How do I find angle x using trigonometric ratios. The angle is opposite side 12. I now

I added the picture down below with the directions!! Help please!! I am not good with Spanish.

which statements are true about the ordered pair (-1,5) and the system of equations x+y=4 x-y=-6

Voy a la República Dominicana para visitar a mis _________ (relatives) .