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
Sever21 [200]
3 years ago
7

why is the electron configuration for copper 1s2 2s2 2p6 3s2 3p6 3d10 4s1 instead of 1s2 2s2 2p6 3s2 3p6 3d9 4s2

Chemistry
1 answer:
grigory [225]3 years ago
4 0
In electron configuration, there are 4 sub-shells S, P, D, that hold a certain amount of electrons.
S - holds up to 2 
P- holds up to 6
D- holds up to 10
In order when doing electron configuration, each sub-shell must  be fully filled before moving onto the next one. That means that if you only have 1 S, you can't move onto the next  sub-shell. In this situation, the 3 d 9 only had 9 of the 10 needed to fully complete its shell. You wouldn't be able to move onto 4 s just yet. This makes the first representation of correct since both shells are completed correctly. 
You might be interested in
Sodium chloride is dissolved in water.<br> Which ions are present in the electrolyte?
IgorC [24]
It is the polar nature of water that allows ionic compounds to dissolve in it. In the case of sodium chloride (NaCl) for example, the positive sodium ions (Na+) are attracted to the negative pole of the water molecule, while the negative chloride ions (Cl−) are attracted to the positive pole of the water molecule.
4 0
3 years ago
Read 2 more answers
How does the structure of the stigma aid in pollination?
inysia [295]
If the stigma is messed up it is hard for bees or insects to pollinate because the way they pollinate is by eating the nectar from the stigma and stick the pollen on their body and stick it on the stigma.

But if there is no stigma=no pollination
A good example of a model is a lily
4 0
4 years ago
According to the law of conservation of mass, what is the same on both sides of a balanced chemical equation?
Firlakuza [10]

According to the law of conservation of mass, what is the same on both sides of a balanced chemical equation?

A. the volume of the substances

B. the subscripts

C. the total mass of atoms

D. the coefficients

Answer:

A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.

Explanation:

Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. ... Use coefficients of products and reactants to balance the number of atoms of an element on both sides of a chemical equation.

Consider the balanced equation for the combustion of methane.

CH

4

+

2O

2

→

CO

2

+

2H

2

O


All balanced chemical equations must have the same number of each type of atom on both sides of the arrow.


In this equation, we have 1

C

atom, 4

H

atoms, and 4

O

atoms on each side of the arrow.


The number of atoms does not change, so the total mass of all the atoms is the same before and after the reaction. Mass is conserved.


Here is a video that discusses the importance of balancing a chemical equation.

8 0
3 years ago
50 POINTS!!!!!!!
KATRIN_1 [288]
We could reduce soil erosion and recycle phosphorus from farm and human waste so that we could help make food production sustainable and prevent algae blooms. We can also do land reclamation as well to help solve this problem. With the land, we would have to design a system to where the land could be functional again in order to plant crops, trees, also to help the wildlife that was once a part of the island. Therefore if the design is done before the mining then afterward we can do the reclamation of the land which would help the people to be able to function after the mining. It would also help the future generations that come along after the previous generations. Everyone must work together in the process in order for everyone to survive. If all this is done then the people of the island would not have to import their food. The reclamation process is the most important thing that has to be designed first whether it is land, soil, water, lakes, and clay then after plant trees, vegetation, and other forms of plants to help replenish the land after the mining is done.

I hope I helped :3
7 0
3 years ago
4Fe + 30₂ ⇒ Fe₂0₃
DaniilM [7]

Answer:

A

The nuber of each one should be same

5 0
2 years ago
Other questions:
  • Can science be disproven by philosophy or religion
    15·1 answer
  • To ensure its survival, any species must be able to
    12·2 answers
  • sample of saline contains 45 ml of saline in 128 ml of water. What is the percent by volume of the solution?
    8·1 answer
  • I need Friend.<br><br><br><br><br><br>Follow me<br>​
    9·2 answers
  • Organisms with traits that are well-suited to an environment tend to survive and reproduce at a greater rate than organisms that
    8·1 answer
  • Which of the following reactions involves two or more substances combining to form a new compound?
    9·1 answer
  • Help pls anyone asap
    5·2 answers
  • Which molecule is a stereoisomer of trans-2-pentene?
    12·1 answer
  • Can someone help me?
    8·1 answer
  • Nuclei<br> 10. Nuclear power plants release energy by
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!