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

How can using a nicotine substitute help a user break the addiction to nicotine?

Where is the genetic material located in a bacteria cell

These examples illustrate which element of the assertive message format? example 1: "kristopher must have forgotten about his agreement not to stop by my place

What's greater 1.04 or 1.0494

which term can be defined as "a collections of glyphs (symbolic figures or letters) that share design features" A Calligraphy B Clip art C Crop D Typeface***

Explain why insulin is no administered orally?

How did Eliza P. Donner Houghton organize her autobiography? She started when she was older and told the story going backwards. In sequential order from the ea

Why did African Americans migrate to Newark at the beginning of the 20th century?

summarize the members of the Woman suffrage movement Where the voice Over The First ten amendments to see details from the text to Support you answer

Rachel earned $34 in 4 hours at her job today. She wants to know how much she could earn (e) tomorrow if she works 10 hours at the same hourly rate.