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
sergij07 [2.7K]
3 years ago
15

What is the total number of valence electrons in an atom with the electron configuration 2-8-1 ?

Chemistry
2 answers:
MakcuM [25]3 years ago
8 0

Answer:

1 because the last one is 1 and the previous shell was complete.

Ilia_Sergeevich [38]3 years ago
8 0

Answer: A)1

Explanation:

Valence electrons are always in Thebes last shell and last number of the configuration.

You might be interested in
Describe the current model of the atom. Name the parts of this model and describe each part.
aivan3 [116]

Answer:

the electron cloud model is the current model of atom

7 0
2 years ago
Read 2 more answers
A student was given a solid containing a mixture of nitrate salts. The sample completely dissolved in water, and upon addition o
finlep [7]

Answer:

Explanation:

   The nitrates of Bi,Sn and Cd is ruled out because their sulfides are insoluble in acidic medium.

Nitrates of Ni or Co may be present because their sulfides are insoluble in basic medium. The presence of other nitrates are ruled out.

5 0
2 years ago
Using VSEPR model, how is the molecular arrangement about the central atom (molecular geometry) for XeF4?
jeka57 [31]

Answer:

Square planar.

Explanation:

Hello,

In this case, it can be demonstrated that the central atom Xenon in XeF₄ has a sp³d² hybridization which means that its geometry is likely to be octahedral.  Nevertheless Applying by applying the valence shell electron pair repulsion (VSEPR) model to in order to minimize the repulsion among lone pairs, bond pairs and lone pair-bond pairs, we we realize repulsion is actually minimized when lone pairs are anti to one another and the fluorine atoms are in equatorial position, for that reason, the corrected and properly exhibited geometry or molecular arrangement of the compound turns out square planar. You can verify it on the attached picture.

Regards.

8 0
3 years ago
A 3.28 L solution is prepared by dissolving 535 g CaCl2 in water. The molar mass of CaCl2 is 110.98 g. What is the morality of t
andrey2020 [161]

Answer:

              1.47 mol/L

Explanation:

Molarity is given as,

                           Molarity = Moles / Vol in L    ------- (1)

Moles of CaCl₂,

                           Moles = Mass / M.Mass

                           Moles = 535 g / 110.98 g/mol

                           Moles = 4.82 mol

Now, putting values in eq. 1.

                           Molarity = 4.82 mol / 3.28 L

                           Molarity = 1.47 mol/L

5 0
2 years ago
A(n) _______________ is a negatively charged ion
siniylev [52]
An anion is a negatively charged ion. 

Hope this helps xox :)
3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the Kelvin temperature for 30°C?
    7·1 answer
  • The pictures below show water in a glass and oil in a beaker.
    12·2 answers
  • Which phrase describes an irregular galaxy?
    8·2 answers
  • How many moles in .5g of sodium bromide?
    9·1 answer
  • The ratio of the initial to the final pressure of a given mass of gas is 1:1.5. Calculate the final volume of the gas if the ini
    7·1 answer
  • What is formula of matter
    13·1 answer
  • A system in which heat moves through the system
    8·1 answer
  • 238/93Np → 0/-1e + ?
    15·1 answer
  • Which coefficients will balance the following reaction:
    14·1 answer
  • Infrared radiation emitted from the Earth's surface to the atmosphere is _____.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!