Answer:
The Aufbau Principle simply helps us determine electron configuration of an atom by stating that in the ground state of an atom or ion, electrons fill subshells of the lowest available energy level, then they fill subshells of higher energy level. For example, the 1s subshell is filled before the 2s subshell is occupied. Now, when trying to figure out the electron configuration of a calcium, you need to know its atomic number to determine its amount of total electrons. Calcium has an atomic number of 20, which means it has 20 protons and 20 electrons. First remember that the "s" subshell only holds 2 electrons, the "p" subshell only hold 6 electrons, and the "d" subshell only holds up to 10 electrons. Using the Aufbau principle below, we can determine that the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s is now full we'll move to the 3p where we'll place the next six electrons. We now go to the 4s orbital where we place the remaining two electrons. With this, the calcium electron configuration will be:
Hope that helps you understand!
Answer:
0.5133805136 moles.
Explanation:
1 gram of Al2(Co3)3 equals 0.0017112683785004 moles, we need the amount of moles produced in 300 grams of Al2(CO3)3, so we have to multiply 1 gram of Al2(CO3)3 times 300: 0.0017112683785004 x 300, in conclusion,
300 grams of Al2(Co3)3 equals 0.5133805136.
Physical and chemical changes are the property of the reactions. The best observation evident of the chemical change is the deposition of the brown crust over the marshmallow.
<h3>What is a chemical change?</h3>
A chemical change is a change that results in the formation of a new substance that cannot be changed back into its original form. They are irreversible and include decomposition, combination, and addition reactions.
The color change of the marshmallow from white to brown shows the chemical change that cannot be reversed back to the original form while the melting of the candle and heating of the metallic fork are physical changes.
Therefore, the burning of marshmallows is a chemical change.
Learn more about chemical change here:
brainly.com/question/2268111
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Answer:
0.11645 moles
Explanation:
moles=n
M is molar mass of substance
m is in grams
n=m/M
So, 7.40/63.546 = 0.11645
0.116(rounded to sig figs)
Answer:
Determine the volume of occupied by 2.34 grams of carbon dioxide gas at STP?
It's simple problem of ideal gas equation.
