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

In dogs, the drug carprofen has a half-life of 8 hours. If a veterinarian gives a dog an 80-milligram dose, how long will it take for the amount of carprofen in

The results from the last quiz that Mr. Tham gave his class are 10, 15, 25, 75, 75, 77, 80, 83, 85, and 90. Which statistical measure makes these scores seem lo

What long term movement does esherick see the boxers as part of

The first object which saluted my eyes when I arrived on the coast was the sea, and a slave ship, which was then riding at anchor, and waiting for its cargo. Th

in plants and animals, gene flow can occur between closely related species. This is Called... A) Hybridization B) Genetic drift C) Non-Random Mating D) Graualis

Physicians can use telemedicine to perform remote diagnosis of patients. a. True b. False

Calculate the freezing point and melting point of a solution containing 10.0g of naphthalene

Two friends left school at the same time and drove in opposite directions. One friend averages 40 miles per hour and the other friend averages 35 miles per hour

Which of the following determines blood volume? -The strength of heart contraction -The amount of water in the blood -ABO blood type and Rh factor -Heart r

The total cost of a vacation to a rain forest includes a fee of $560 for the tour guide, plus $630 per person. The function y=560+630x/ x models the average co