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
koban [17]
3 years ago
9

Define atomic numberand mass number. Which can vary without changing the identity of the element?

Chemistry
1 answer:
Volgvan3 years ago
8 0

Explanation:

Atomic number is defined as the number of an element which represents total number of protons.

When an atom is neutral then it means it contains same number of protons and electrons.

On the other hand, atomic mass is defined as the sum of total number of protons and neutrons present in an atom.

Protons of every element remains fixed because it shows the identity of each element but if we change the number of neutrons then also identity of the atom will remain fixed. This is because changing the number of neutrons will not show any change in number of protons.

For example, ^{2}_{1}H and ^{3}_{1}H are isotopes of hydrogen and they have same number of protons but different number of neutrons.

Thus, we can conclude that number of neutrons can vary without changing the identity of the element.

You might be interested in
Explain why heating a liquid causes it to evaporate more quickly.
Elina [12.6K]

Answer:

If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.

Explanation:

7 0
2 years ago
Describe at least two experiments, including the observed results, that caused the scientific community to accept changes to Dal
WINSTONCH [101]
The model after John Dalton's was J.J Thompson's plum podding model in 1897, which described electrons as dots or raisins(if you will) in a circle shaped pudding that was entirely positive using a Cathode Ray Tube(shot cathode rays between magnets). The model after that is the Niels Bohr model in 1913, which depicts atoms like positively charged center called the nucleus with negatively charged particles called electrons in a shell or cloud.
5 0
3 years ago
What are the four points of food safety?​
KatRina [158]

The four steps of food safety are:

  • Clean: Wash your hands and clean surfaces often
  • Separate: Don't cross-contaminate the food
  • Cook: Cook the food to the right temperature
  • Chill: Refrigerate promptly

Hope this helps! If you need more help or have any questions just message me! :)

7 0
3 years ago
There are several different models that represent compounds. One type of model is shown.
Kipish [7]
What I’m seeing on quizlet says what you’re describing is a ball-and-stick model.
3 0
2 years ago
Read 2 more answers
A sample contains 16. 75 g of the radioisotope U-236 and 50. 25 g of its daughter isotope, Th-232. How long did it take for deca
garri49 [273]

The time taken for the isotope to decay is 46 million years.

We'll begin by calculating the number of half-lives that has elapsed. This can be obtained as follow:

  • Original amount (N₀) = 50.25 g
  • Amount remaining (N) = 16.75
  • Number of half-lives (n) =?

2ⁿ = N₀ / N

2ⁿ = N₀ / N

2ⁿ = 50.25 / 16.75

2ⁿ = 3

Take the log of both side

Log 2ⁿ = 3

nLog 2 = Log 3

Divide both side by log 2

n = Log 3 / Log 2

n = 2

Finally, we shall determine the time.

  • Half-life (t½) = 23 million years
  • Number of half-lives (n) = 2
  • Time (t) =?

t = n × t½

t = 2  × 23

t = 46 million years

Learn more about half-life: brainly.com/question/25927447

8 0
2 years ago
Read 2 more answers
Other questions:
  • Which liquid would be the most difficult to raise or lower the temperature of
    13·2 answers
  • Using the words Kool Aid, sugar, and water, explain how a solution can be:
    5·1 answer
  • If glucose is the sole energy source, what fraction of the carbon dioxide exhaled by animals is generated only by the reactions
    12·2 answers
  • Lol nevermind i figured it out
    8·1 answer
  • When a strong acid reacts complete with a strong base (a neutralization reaction), what compounds are always formed?
    13·2 answers
  • A solution is prepared by mixing 0.0300 mol CH2Cl2 and 0.0500 mol CH2Br2 at 25 degrees C. Assuming the solution is ideal, calcul
    15·1 answer
  • 3. Use the balanced chemical equation from the last question to solve this situation: You combine 0.5 grams of Na2CO3 with exces
    8·1 answer
  • How many moles of KCl are in <br> 28g of KCl?
    5·2 answers
  • 1.52 moles of gas are at a pressure of 99.5kPa and a temperature of 298K. What is the volume of the gas
    10·1 answer
  • How many protons, electrons, and neutrons are in calcium?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!