chelsey1002 chelsey1002

16-12-2016
Mathematics

contestada

How many neutrons does element X have if its atomic number is 57 and its mass number is 168?

Respuesta :

Apocrophon Apocrophon

16-12-2016

Mass number is # of protons + # of neutrons
since the atomic number is the number of protons, the number of protons is 57
so 168 = 57 + x
x = 111 neutrons

Answer Link

Аноним Аноним

16-12-2016

Mass number is number of protons + number of neutrons

168 - 57 = Answer

Answer = 111

Answer Link

Otras preguntas

An α-particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.24 106 V and the

HELP PLZZ I NEED A MATH EXPERT FOR MATH IN LINEAR FUNCTIONS AND GRAPHS AND NUMBER LINES !!!! ANYONE!

On a coordinate plane, a line goes through (negative 3, 2) and (2, negative 1). A point is at (3, 0). What is the equation of the line that is perpendicular to

Which best describes a mutation? A. a recessive gene B. a missing protein c. a change to a gene D. a missing chromosome

Adjustments are made to ensure that: A. Expenses are recognized in the period in which they are incurred B. Revenues are recorded in the period

The ph of vinegar is 2.9 and the ph of milk is 6.6. How many times greater is the hydrogren ion concentration of vinegar than of milk?

Round your answer to the nearest hundredth.

if f(x)=-3 then x=___

Fluent readers think about, summarize, and synthesize information as they read true false

what is the graph of y=-x+2