The symbol of the ion having 12 protons and 10 electrons would be Mg²⁺ , therefore the correct answer is option A.
<h3>What is the atomic number?</h3>
An atom's atomic number is determined by the total number of protons it contains. Both the number of neutrons and the number of electrons contained inside an atom have no connection to the atomic number.
We must determine the symbol for the ion with 12 protons and 10 electrons according to the problem.
As is well knowledge, the magnesium atom, symbolized by Mg2+, contains 12 electrons and 10 protons.
Thus, the correct answer is option a.
To learn more about the atomic number from here, refer to the link;
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Becasue steel particles may contaminate the flour.
Answer:
a) The speed is 61.42 m/s
b) The drag force is 10.32 N
Explanation:
a) The Reynold´s number for the model and prototype is:


Equaling both Reynold's number:

Clearing Vm:

b) The drag force is:

Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy.
Answer:
Energy cannot be changed from one form to another without a loss of usable energy
Explanation:
Second law of thermodynamics states that the total entropy or the randomness of the system remains constant over time. It also states that the net entropy will remain the same or it will increase.
Entropy of a system is given by heat absorbed divided by temperature. It is given by :

So, the correct option is (A) "Energy cannot be changed from one form to another without a loss of usable energy".