85 points + you + brainliest for whomever can me with this question pretty with a cherry on top

below are the bohr models of three different neutral atoms. the solid black circle in the middle represents the nucleus. the concentric circles represent the shells or principle energy levels. the red dots represent the electrons present in each shell or principle energy level.

#14 identify the three elements represented in the bohr models above and then describe the position of each element on the periodic table.

#15 place the three elements in order of decreasing atomic radius and explain why.

14. Be, Mg, Ca in Group 2.

15. Ca > Mg > Be

Step-by-step explanation:

14. Identify the elements.

Atom A has the shell configuration 2, 2.

It has four electrons, so it is Element 4 in the Periodic Table: Be (beryllium).

Atom B has the shell configuration 2, 8, 2.

It has 12 electrons, so it is Element 12 in the Periodic Table: Mg (magnesium).

Atom C has the shell configuration 2, 8, 8, 2.

It has 20 electrons, so it is Element 20 in the Periodic Table: Ca (calcium).

Each element has two electrons in its outermost shell, so they all belong in Group 2 of the Periodic Table.

15. Order of atomic radii

The Figure below shows the position of the elements in Group 2.

As you go down the Group, the atoms get bigger, because each atom has one more electron shell than the one above is, and each shell is bigger than the one before it.

Thus, the atomic radius increases in the order Be < Mg < Ca.  

However, "they" want the order of decreasing radius, so we must go up the Group.

The elements in order of decreasing radius are

Ca > Mg > Be.

possibly, yes.

explanation:

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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.