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

PLEASE HELP ME ITS URGENT ! An office has 7 male employees and 8 female employees. The manager randomly chooses 2 employees to attend a football game. What is

Recap me ok area of circle the formula of

which statement best summarizes two major effects of modernization on world religions A.while some groups have embraced religious radicalism others have become

A substance is NOT required to __________ to be considered a mineral. a. be naturally occurring b. be solid c. have atoms arranged in an orderly pattern d. cont

I don’t how to solve this problem

The black middle class is larger than most people assume True False

Seamounts: A) Are volcanoes that form on the ocean floor. B) Are submarine canyons found of the coast of Chile. C) Form only in the Pacific Ocean basin. D)

5 inches is what fraction of a foot?

Please help ASAP I have 66 math lessons left and 31 days to do it how much lessons do I need to do each day (Example 2 lessons per day for 20 days and 3 lesso

If an object maps onto itself after being rotated 180 degrees or less about a line, it has