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
geniusboy [140]
3 years ago
13

How many neutrons do (k) potassium-39 and potassium-40 have, respectively?

Chemistry
1 answer:
Maurinko [17]3 years ago
7 0
Potassium’s atomic number in periodic table is 19, Potassium can only have a mass numbers of 41, 40 and 39. Potassium 39, 40, and 41 are all different isotopes of the element potassium. Each of the isotopes has 19 electrons and 19 protons but the number of neutrons vary. So, in your question Potassium-39 has twenty (20) neutrons, and potassium-40 has 21 neutrons.
You might be interested in
Boron has two isotopes, Boron 10 which has a mass of 10.0129 amu and Boron-11 with a mass of 11.0093 amu. B-10 occurs 84.74% of
podryga [215]

The average atomic mass of Boron: 10.431 amu

<h3>Further explanation   </h3>

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.  

So Isotopes are elements that have the same Atomic Number (Proton)  

Atomic mass is the average atomic mass of all its isotopes  

In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu  

Mass atom X = mass isotope 1 . % + mass isotope 2.%  + ...

The average atomic mass of boron :

\tt avg~mass=0.8474\times 10.0129+0.1526\times 11.0093\\\\avg~mass=10.431~amu

3 0
3 years ago
in 1866, Gregor Mendel published his paper that described the research that led to his discovery of the laws of inheritance. Mor
julia-pushkina [17]
The answers will help you!!!!!
~~~~~~~~~~~~~~~~~~~~~~~~~~
The statement describes from the relationship between multiple approaches and familiarity with similar work. The answers is would be last sentences. D. Multiple approaches may occur because scientists develop similar interests independently.
4 0
3 years ago
Read 2 more answers
Describe what the isotopes of an element have in common and how are they different.
Neporo4naja [7]

Answer:

Isotopes of an element are atoms of the same element that have different number of neutrons.

8 0
3 years ago
Read 2 more answers
Consider the solubilities of a particular solute at two different temperatures.
GenaCL600 [577]

Explanation:

can you make your question understandable?

I'll try to solve it

4 0
2 years ago
In a chemical compound, would you expect an oxide ion to be joined with one atom of calcium or one atom of potassium? Why?
Soloha48 [4]

I know what you're asking but I don't think the question is stated properly. Technically, an atom will not join with an "oxide" ion; i.e., the oxide ion is an atom of oxygen to which two electrons have been added. An oxide ion will add to 2 K ions or 1 Ca ion. The K ion has lost just one electron so it takes two of them to equal the 2- charge on the oxide ion whereas the Ca ion has lost two electrons and it takes only one of them to equal the charge on the oxide ion.

4 0
3 years ago
Other questions:
  • A sample of ammonia has a mass of 82.9 g. how many molecules are in this sample?
    9·2 answers
  • Why is nature more influential than nurture?
    13·2 answers
  • Three cards with holes are arranged in a straight line. A light is shined through the first card’s hole and travels through all
    11·2 answers
  • Which statement concerning elements is true
    10·1 answer
  • Which liquid has the highest vapor pressure
    13·1 answer
  • A plasma-screen TV contains thousands of tiny cells filled with a mixture of Xe, Ne, and He gases that emits light of specific w
    10·1 answer
  • 2 H2 + O2 → 2 H2O What is the product of this chemical reaction
    13·1 answer
  • The half-life of a radioactive kind of strontium is 3 hours. If you start with 64 grams of it, how
    6·1 answer
  • 10. Sound is characterized in how many ways?<br> A. 5<br> B. 3<br> C. 4<br> D. None of the above
    9·2 answers
  • Need answer asap 4 both
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!