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

1.08 to the 3rd power?

A student graphed distance versus time for an object that moves 14m every 2 s. the speed of the object is

A student graphed distance versus time for an object that moves 14m every 2 s. the speed of the object is

why does bread dough is needed to be left for hours or a day before baking?

d) At the New York Stock Exchange a certain online gaming stock had an initial public offering (IPO) price of 10 USD per share and is traded 24 hours a day. Ske

Suppose D(T) = A(T-H)2 +K represents the hieght of an object in feet after T seconds. Suppose an object has a maximum height of 12 feet after 2 seconds. This sa

Question 2 (4 points) Draw in a complementary set of nucleotides on the right side of the figure below to produce the double-stranded structure of DNA. You'll h

A car starts from rest and travels for 4.0s with a uniform acceleration of + 1.3m/s^2. The driver then applies the brakes, causing a uniform acceleration of - 1

how many molecules of oxygen is in water

Question for Math! I have a 200-point math test coming up, and I don't get the concept of this question, but if somebody is willing to help me out on this quest