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

which is a feature of expressionism? select all that apply. objective realityemperical fact primitivismnatural settings

The price of oil was USD 60.00 per barrel in September. The price fell by one third from september to March. By what fraction must the March price per barrel ri

Which equation in standard form has a graph with a slope of -3/4 and a y-intercept of 1?

what does 4(3+2x) equal

what can people do if american democracy is threatened by a coup?

A laptop has a listed price of $899.95 before tax. If the sales tax rate is 6.5%, find the total cost of the laptop with sales tax included. Round your answer t

San Diego, CA, and San Francisco, CA, are about 550 miles apart. If you were putting these two cities on a map, how many inches apart would they be?

2. How would you categorize the software that runs on mobile devices? Break down these apps into at least three basic categories and give an example of each

Can someone answer this for me please and ASAP!

SOMEONE HELP ME! I WILL MARK AS BRAILY