E and B
Explanation:
The last option violates Aufbau's principle.
Aufbau's principle states that "the sublevels with lower energies are filled up before those with higher energies."
This implies that orbitals are not filled based on numerical order but on their energy levels.
The order is as follows;
1s 2s 2p 3s 3p 4s 3d e.t.c
In B, the 3s was not filled before jumping to 3p
In E, 3p was not filled before jumping to 3d and 3d was not even the next orbital.
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Atomic orbital brainly.com/question/1832385
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Voltmeter is the device that is used to measure the potential difference across the battery.
<h2>What are the usage of voltmeter?</h2><h3 /><h3>Usage of Voltmeter</h3>
Voltmeter is an instrument that measures voltages of both direct and alternating electric current. On a scale of voltmeter usually graduated in volts, millivolts (0.001 volt), or kilovolts (1,000 volts).
Voltmeter is connected in parallel form. It has a high resistance so that it takes negligible current from the circuit so we can conclude that Voltmeter is the device that is used to measure the potential difference across the battery.
