Question
Asked Jan 27, 2020
193 views

A se atom has a mass number 78. Determine the number of neutrons, electrons and protons in this neutral isotope. 

check_circle

Expert Answer

Step 1

Selenium atom:

  • In this atom, the atomic number illustrated by subscript and the mass number illustrated by superscript. Thus, the atomic number of selenium is 34 and mass number is 78.
  • The atomic number is equal to the number of protons which is equal to number of electrons in an atom.

Hence, the number of protons and electrons in Se atom is 34.

Step 2

To find number of neutrons of Selenium atom:

The mass...

Chemistry homework question answer, step 2, image 1
fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: E2d. On birthday parties, balloons are commonly used. You can buy the inflated balloons or buy a hel...

A: (a) Atmospheric pressure is 1 atm.

question_answer

Q: Which of the following  compounds will have the lowest boiling point. Select one: a. CH4 b. CBr4 ...

A: Option (a):Among the following compounds, the boiling point of CH4 compound is low which has -161.5°...

question_answer

Q: What is the λ (in m) of an electromagnetic wave that has a frequency of 3.64 x 107 Hz?  Enter a nume...

A: Frequency, wave length and velocity of light can be related as follows,

question_answer

Q: Determine the molarity of each of the following solutions from its osmotic pressure at 25°C. Include...

A: The molarity of the solution of urea can be calculated as

question_answer

Q: Nonmetals typically ______ and metals typically ______.   A. donate  neutrons; accept neutro...

A: Non-metals typically ______ and metals typically ______. A.donate  neutrons; accept neutrons B.accep...

question_answer

Q: A sample consisting of various gases contains 3.1×10−63.1×10−6 molemole fraction of radon. This gas ...

A: The pressure of radon gas is calculated as,

question_answer

Q: When 1.35 g of an unknown non-electrolyte is dissolved in 50.0 g of benzene, the freezing point decr...

A: Relative lowering in the vapor pressure of a solution is a colligative property that depends on the ...

question_answer

Q: calculate the number of grams of bromine needed to react exactly with 50.1g of aluminum

A: Solution stoichiometry is mainly based on the calculation of moles and volumes. These two values are...

question_answer

Q: A sample containing 1 mol of gas at 25o C and p = 5.0 atm has a volume 4.5 L. What is a compression ...

A: Compression factor is denoted by Z also known as correction factor. The deviation of the real gas fr...