Calcium (Ca) has an atomic number of 20, and its electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2.

Bromine (Br) has the electronic configuration ending in 4p5, corresponding to atomic number 35.

The element with the configuration [Kr] 5s2 4d10 5p5 is Astatine (At), which has atomic number 85.

Strontium (Sr) has 38 electrons, and its electronic configuration is [Kr] 5s2.

The electronic configuration [Ne] 3s2 3p1 corresponds to Aluminum.

Magnesium (Mg) has 12 electrons, and its electronic configuration is [Ne] 3s2.

The electronic configuration [Ne]3s²3p⁵ corresponds to Bromine.

Mercury (Hg) has an atomic number of 80, and its electronic configuration is [Xe] 6s2 4f14 5d10.

The element with the configuration [Xe] 6s2 is Barium.

Chlorine (Cl) has the highest electronegativity and its configuration is 1s2 2s2 2p6 3s2 3p5.

Potassium (K) has the highest energy level with the configuration [Ar] 4s1.

Lithium (Li) has the highest ionization energy among the given alkali metals due to its smaller atomic size.

Nitrogen (N) has the configuration 1s2 2s2 2p3, which has a half-filled p subshell.

Chromium (Cr) has an electronic configuration of [Ar] 4s1 3d5, which means it has an incomplete d-subshell.

Argon has 18 electrons, and its electronic configuration is 1s2 2s2 2p6 3s2 3p6.

Bromine (Br) has the atomic number 35, and its configuration ends in 4p5.

The element with the configuration [Kr] 5s2 4d10 5p5 is Astatine.

The configuration [Kr] 5s2 4d10 5p5 corresponds to Astatine.

Mercury (Hg) has the electronic configuration [Xe] 4f14 5d10 6s2.

Bismuth (Bi) has the electronic configuration [Xe] 6s2 4f14 5d10.

The configuration 1s2 2s2 2p6 3s2 3p5 (Chlorine) has the highest energy due to the presence of an unpaired electron.

Selenium (Se) has the highest energy electron in the 4p subshell with the configuration [Ar] 4s2 3d10 4p4.

Silicon (Si) has the highest ionization energy among the given elements due to its higher nuclear charge and smaller atomic radius.

The 3s orbital has the highest energy among the given options due to its higher principal quantum number.

The magnetic quantum number (m_l) can take negative values, ranging from -l to +l.

The azimuthal quantum number (l) can have a value of 0, which corresponds to an s orbital.

The principal quantum number n can never be negative; it starts from 1.

The principal quantum number (n) is always a positive integer (1, 2, 3, ...).

The azimuthal quantum number (l) determines the shape of the orbital.

The magnetic quantum number (m_l) describes the orientation of an orbital.