It cropped out “D” but D is Calcium please help asap !!!

Option A. Potassium.

Explanation:

The electronic configuration of the element given above is:

1s2 2s2 2p6 3s2 3p6 4s1

To know which element has the above electronic configuration, we simply calculate the atomic number of the element. This can be obtained by adding the electrons in the electronic configuration as follow:

2 + 2 + 6 + 2 + 6 + 1 = 19

The atomic number of the element is 19.

Atomic number is the identity of elements in the periodic table. No two elements have the same atomic number.

Therefore, the element is Potassium because only potassium has atomic number of 19 in the periodic table.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.