Short Answer Questions 18 points 1) What year was Mendeleev born?
2) Where was Mendeleev born?
3) Explain how Mendeleev arranged his periodic table.
4) What were the 3 Elements that were missing from Mendeleev’s Periodic Table?

5) When did Mendeleev die? Exact date
6)Which particles are in the nucleus of an atom?

1) He was born on February 8, 1834

2) He was born in Tobolsk, Russia

3) Mendeleev arranged the elements in order of increasing relative atomic mass.

4) Gallium, germanium, and scandium

5) He died on February 2, 1907

6) Protons (positive charge) and neutrons (neutral charge)

a electronegativity decreases beacuse the size of nucleus is bigger.

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.