1. DMITRI IVANOVICH MENDELEEV "FATHER OF MODERN PERIODIC TABLE"
1.1. On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.
2. WHO MADE THE PERIODIC TABLE OF ELEMENTS?
3. WHAT IS A PERIODIC TABLE? Is the arrangement of all the discovered chemical elements, which is arrange in a way of increasing atomic mass from left to right and top to bottom.
3.1. PARTS OF A PERIODIC TABLE
3.1.1. GROUPS - are the vertical columns found in the periodic table.Each groups are classified on how many valence electron are there in an atom. And there total of 18 groups.
3.1.1.1. Specific groups are transition metals, rare earths, alkali metals, alkaline earth, halogens, and noble gasses.
3.1.2. PERIODS- are the horizontal rows of the periodic table and there are only 7 periods. The periods are also the indicator on how many electron shell an atom have.
3.2. The periodic table is used to identify the properties of the elements that are yet to be discovered
4. ELECTRON CONFIGURATION
4.1. Aufbau principle which has Sharp(s)- 2 electrons, Principal (P)- 6 electrons, Diffuse(D)- 10 electrons and Fundamental(F)-14 electrons
5. CONTRIBUTORS FOR THE DEVELOPMENT OF THE PERIODIC TABLE
5.1. JOHN WOLFGANG DOBEREINER - Dobereiner's triad
5.2. JOHN ALEXANDER NEWLANDS- Law of Octaves
5.3. HENRY MOSLEY - Atomic Number
6. IONIZATION ENERGY
6.1. Is how much energy needed to remove the loose electron in the outer electron shell.
6.1.1. The energy increases from the bottom to the top and in there it increases from left to right. noble gases are not part of it
7. ELECTRON AFFINITY
7.1. It is the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion. The exception to this are the noble gases because they are already stable.
7.1.1. it is measured like the ionization energy it increases from bottom to top and left to the right.
8. ELECTRONEGATIVITY
8.1. The electronegativity is the ability of an atom to hold electrons tightly.
8.1.1. Same as the previous periodic trends which are electron affinity and ionization energy. The energy in electronegativity increases from the bottom to top and left to the right. And that make Fluorine the most electronegative element in the periodicc table. The noble gases are also not included.
9. ATOMIC RADIUS
9.1. It is the distance between the nucleus and the outer electron shell. In simple words it is the size of the atom.
9.1.1. HOW TO DETERMINE THE SIZE? The size of the atom increases from up to the bottom while it decreases from left to right.