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
Natali [406]
3 years ago
12

The periodic table lists two main numbers for each element. the atomic number is an integer that equals the number of protons. t

he number of neutrons is not given in the periodic table because it will vary with different isotopes. the mass number of an element is the sum of the protons and neutrons. to find the number of neutrons, the atomic number must be subtracted from the mass number.
Chemistry
1 answer:
siniylev [52]3 years ago
7 0
Given that isotopes do exist, the mass numbers given on the periodic table reflect the average of the most common isotopes existing. This is calculated:
Atomic Mass=(Fractional abundance of isotope 1*mass of isotope 1)+(Fractional abundance of isotope 2*mass of isotope 2)... depending on how many isotopes there are. But, generally, you can find the most likely number of neutrons by subtracting the atomic number (protons) from the atomic mass(protons+neutrons). 
You might be interested in
If 1.3 L of C3H8 combusts according to the equation below, how much CO2 will be produced?
SCORPION-xisa [38]

Answer:

0.162 moles of CO₂ are produced by this reaction

Explanation:

The reaction is:

C₃H₈(g) + 5O₂(g)  →  3CO₂(g) +4H₂O(g)

As we have the volume of propane, we need to know the mass that has reacted, so we apply density's concept.

Density = Mass / Volume → Density . Volume = Mass

0.00183 g/mL . 1300 mL = Mass → 2.379 g

We determine the moles → 2.379 g . 1mol / 44 g = 0.054 moles

Ratio is 1:3. 1 mol of propane can produce 3 moles of dioxide

Then, 0.054 moles may produce (0.054 .3)/1 = 0.162 moles

6 0
3 years ago
How can forgery be used in crime
Tems11 [23]

Some bad people will tend to forge dollar bills and make fake bills, giving them to cashiers and asking for it to be split into a different amount of bills so they are given real cash and wont be caught or they will buy things, return them and be given back real money and get away with it. This is obviously a crime because it's fake.

3 0
3 years ago
Read 2 more answers
What is wind?
barxatty [35]

Answer:

air that moves from high pressure to low pressure

5 0
3 years ago
Read 2 more answers
All of the Gathered in an investigation must be recorded. (Fill in the blank)
Zigmanuir [339]
The answer is "Incidents"
4 0
3 years ago
PLEASE HELP!!
just olya [345]

Answer:

Ecosystem services are indispensable to the wellbeing of all people, everywhere in the world. They include provisioning, regulating, and cultural services that directly affect people, and supporting services needed to maintain the other services.

5 0
3 years ago
Other questions:
  • Is there any way to predict the exact location of any one marble drop on the target?
    5·1 answer
  • Mr. Chem S. Tree added water to 250. ML of a 2.50 M NaOH solution, until the final volume was 500. ML. What is the new molarity
    10·1 answer
  • What do these substances have in common? apple juice, helium gas, salt water and copper wire
    12·2 answers
  • 3. What can you conclude about Gregor Mendel from the
    6·1 answer
  • Calculate the pH and pOH of 500.0 mL of a phosphate solution that is 0.285 M HPO42– and 0.285 M PO43–. (Ka for HPO42- = 4.2x10-1
    7·1 answer
  • Which event is caused by gravity?​
    14·1 answer
  • A football player kicks a 0.94 kg football with a force of 2.4 N.
    9·2 answers
  • How many moles of Mg(OH)2 will react with 2.5 mol HCI?
    10·1 answer
  • Which method of heat transfer is due to the transfer of kinetic energy from one molecule to another?
    8·2 answers
  • Calculate the mass of 3.4 moles of nitric acid (hno3). explain the process or show your work by including all values used to det
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!