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
Helga [31]
3 years ago
10

The isotope sodium-20 has how many protons?

Chemistry
2 answers:
kati45 [8]3 years ago
6 0

Answer:

Option A. 9

Explanation:

Isotope results when there is a change in the Neutron number of an atom.

From the question,

Mass number of the sodium isotope = 20

But the atomic number of isotopes are constant. Therefore, the isotope has:

Proton = 11

Mass number = Neutron + Proton

Neutron = Mass number — Proton

Neutron = 20 — 11 = 9

Anna007 [38]3 years ago
4 0

Answer:11

Explanation:

You might be interested in
Use the molar bond enthalpy data in the table to estimate the value of Δ∘rxn
MakcuM [25]

Answer:

ΔH°rxn = - 433.1 KJ/mol

Explanation:

  • CH4(g) + 4Cl2(g) → CCl4(g) + 4HCl(g)

⇒ ΔH°rxn = 4ΔH°HCl(g) + ΔH°CCl4(g) - 4ΔH°Cl2(g) - ΔH°CH4(g)

∴ ΔH°Cl2(g) = 0 KJ/mol.....pure element in its reference state

∴ ΔH°CCl4(g) = - 138.7 KJ/mol

∴ ΔH°HCl(g) = - 92.3 KJ/mol

∴ ΔH°CH4(g) = - 74.8 KJ/mol

⇒ ΔH°rxn = 4(- 92.3 KJ/mol) + (- 138.7 KJ/mol) - 4(0 KJ/mol) - (- 74.8 KJ/mol)

⇒  ΔH°rxn = - 369.2 KJ/mol - 138.7 KJ/mol - 0 KJ/mol + 74.8 KJ/mol

⇒ ΔH°rxn = - 433.1 KJ/mol

4 0
3 years ago
Read 2 more answers
Sixty-three percent of the number 1059 is
slega [8]
667.17 (0.63x1059) shsbsbsb
4 0
2 years ago
Read 2 more answers
A sealed flask contains 3.82 x 1024 molecules of CO, How many moles of Co, are in the flask?
Lynna [10]

Answer:

3.82 × 1024

= 3911.68

<h3>I hope this helps!</h3>
4 0
2 years ago
Read 2 more answers
Which is a difference between Volume and Surface Area?
MArishka [77]

Answer:

Surface area is the sum of the areas of all the faces of the solid figure. ... Volume is the number of unit cubes that make up a solid figure. Volume is the amount of space inside of the solid figure.

Explanation:

3 0
2 years ago
Read 2 more answers
How can you form new neural pathways that will lead to transformed thinking and a transformed life?
aleksandr82 [10.1K]
When you understand how neural pathways<span> are created in the brain, you ... But because I had the </span>will<span> to do it, I built a </span>new<span> pathway, and I rewired or reprogrammed my brain. ... can learn </span>new<span> behaviors and attitudes and can </span>transform<span> their </span>lives<span>. ... to the habit, and see what results you're </span>creating<span> in your </span><span>life</span>
6 0
3 years ago
Other questions:
  • What type of wave can actually reach Earth's inner core
    9·1 answer
  • In a chemical reaction, a certain compound changes intoanother compound at a rate proportional to the unchanged amount. ifinitia
    10·1 answer
  • Which of the following is a compound? <br> a. air <br> b. soda <br> c. sterling silver <br> d. water
    6·1 answer
  • A concentration cell consists of two Sn/Sn2+ half-cells. The solution in one half-cell A is 0.13 M Sn(NO3)2 and is 0.87 M Sn(NO3
    7·1 answer
  • Onsider this representation of an original DNA sequence: THE TALL MAN WAS SAD.
    7·2 answers
  • Mayonnaise is made up of eggs, oil, and vinegar. Under which category it should be<br> classified?
    15·1 answer
  • What is the independent and dependent<br> variable for a dry ice experiment
    15·1 answer
  • What is the name for the compound S3N2
    13·1 answer
  • Please rank the following atoms from smallest to largest: Ge, P, O
    11·1 answer
  • Which is an alkaline earth metal?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!