In relational databases, a record is defined as a group of related data held within the same structure. Furthermore, we can say that a record is a grouping of fields within a table that reference one particular object.

Now, in relational database, a row is called a record because each row, contains a unique instance of data or key for the categories defined by the columns.

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1 year ago

four quantum numbers that could represent the last electron added (using the Aufbau principle) to the Argon atom. A n = 2, l =0,

marshall27 [118]

Answer:

n = 3

$l$ = 1

$m_l$ = 1

$m_s=+1/2$

Explanation:

Argon atom has atomic number 18. Then, it has 18 protons and 18 electrons.

To determine the quantum numbers you must do the electron configuration.

Aufbau's principle is a mnemonic rule to remember the rank of the orbitals in increasing order of energy.

The rank of energy is:

1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 7d

You must fill the orbitals in order until you have 18 electrons:

1s² 2s² 2p⁶ 3s² 3p⁶ : 2 + 2 + 6 + 2 + 6 = 18 electrons.

The last electron is in the 3p orbital.

The quantum numbers associated with the 3p orbitals are:

n = 3

$l$ = 1 (orbitals s correspond to $l$ = 0, orbitals p correspond to $l$ = 1, orbitals d, correspond to $l$ = 2 , and orbitals f correspond to $l$ = 3)

$m_l$ can be -1, 0, or 1 (from - $l$ to + $l$ )

the fourth quantum number, the spin can be +1/2 or -1/2

Thus, the six possibilities for the last six electrons are:

(3, 1, -1 +1/2)
(3, 1, -1, -1/2)
(3, 1, 0, +1/2)
(3, 1, 0, -1/2)
(3, 1, 1, +1/2)
(3, 1, 1, -1/2)

Hence, the correct choice is:

n = 3

$l$ = 1

$m_l$ = 1

$m_s=+1/2$

5 0

3 years ago