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

what part did religion beliefs play in medieval African societies?

how do you find these?

The process of meiosis ensures that organisms will have __________. a. a different haploid number than its parents have b. different numbers of chromosomes than

what is the function of the Endoplasmic Reticulum

Of the molecules below, the bond in __________ is the most polar. hbr hi hcl hf

Which material erupted from volcanoes is important in acid rain Sulfur dioxide Ash Carbon monoxide Carbon dioxide

16) A Patriot in North America in the 1770s would have MOST LIKELY supported which of these? Question 16 options: boycotting British-made goods supporting the "

If the nucleus of an atom contains 12 protons how many electrons are there in a neutral atom

Indus River Valley-Today (What do people do for a living? What sorts of activities form the livelihood of people?) PLEAS HELP MEEEEEEEEE

Based on this excerpt from "How Much Land Does a Man Need?" by Leo Tolstoy, how is the author using the character of the Devil? "Of course our work is rough and