1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Natasha2012 [34]
3 years ago
7

A strontium-90 atom that has a lost two electrons has __________ protons, __________ neutrons, and __________ electrons.

Chemistry
1 answer:
MAXImum [283]3 years ago
4 0
<span><em>Answer:</em>
A strontium-90 atom that has a lost two electrons has <u>38</u> protons, <u>52</u> neutrons, and <u>36</u> electrons.

<em>Explanation:
</em>Atomic number<em> of </em>Strontium (Sr) is 38. 
<em>Atomic number = number of protons 
</em>Hence, Strontium has 38 protons.

If the element is in neutral state,
                number of protons = number of electrons. 
Then, neutral Strontium atom should have 38 electrons. 
But the question says Sr has lost 2 electrons. Hence, number of electrons should be 38 - 2 = 36.

Mass number = number of protons + number of neutrons.

The given mass number is 90. Hence, number of neutrons should be 90 - 38 = 52.</span>
You might be interested in
What three kinds of medals are awarded at the Olympic Games?
Serjik [45]
An Olympic decoration is granted to effective contenders at one of the Olympic Amusements. There are three classes of decoration: gold, granted to the victor; silver, granted to the first sprinter up; and bronze, granted to the second sprinter up.
5 0
3 years ago
Read 2 more answers
If you had 240 L container at 479 k and 300 kpa, what would the volume be if you changed the conditions to STP
nydimaria [60]

Answer:

The answer to your question is V2 = 434.7 l

Explanation:

Data

Volume 1 = V1 = 240 l                             Volume 2 = ?

Temperature 1 = T1 = 479°K                   Temperature 2 = T2 = 293°K

Pressure 1 = P1 = 300 KPa                      Pressure 2 = P2 = 101.325 Kpa

Process

1.- Use the combined gas law to solve this problem

                P1V1/T1 = P2V2/t2

-Solve for V2

               V2 = P1V1T2 / T1P2

2.- Substitution

                V2 = (300)(240)(293) / (479)(101.325)

3.- Simplification

                V2 = 21096000 / 48534.675

4.- Result

                V2 = 434.7 l

6 0
3 years ago
Which choice names part of the lithosphere?
9966 [12]
The lithosphere is the solid, outer part is the earth it includes the brittle upper portion of the mantle and the crust and the outermost layers of Earths structures
6 0
2 years ago
Use the following chemical equation to answer the question:
garik1379 [7]

2 atome nitrogen , 1 is correct

5 0
3 years ago
The atomic mass of magnesium is the weighted average of the atomic masses of
mojhsa [17]
Of... its isotopes multiplied by each of their respective abundances
6 0
3 years ago
Other questions:
  • A person with a body temperature of 37°C holds an ice cube with a temperature of 0°C in a room where the air temperature is 20.°
    14·1 answer
  • Which of the following substances is non-living and is the smallest part of all matter?
    9·2 answers
  • When finding the density of a solid, which situation prevents us from being
    9·1 answer
  • Ty for anyone helping!
    12·1 answer
  • What is a mixture,what is a solution
    5·2 answers
  • Determine the volume of a piece of gold with a mass of 318.97g
    14·1 answer
  • What is the answer pllleeaasseeeee?????
    5·1 answer
  • How does an object look when it is viewed through an opaque object ​
    8·1 answer
  • How do you describe the particles in a liquid? ​
    9·2 answers
  • Question 9 (4 points)
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!