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What is the Periodic Table? Why is Periodic Table Made?
The periodic table is an arrangement of all the elements known to man in accordance with their increasing atomic number and recurring chemical properties. They are assorted in a tabular arrangement wherein a row is a period and a column is a group. Elements are arranged from left to right and top to bottom in the order of their increasing atomic numbers. Thus,- Elements in the same group will have the same valence electron configuration and hence, similar chemical properties.
- Whereas, elements in the same period will have an increasing order of valence electrons. Therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases.
Why was Mendeleev Periodic Table widely accepted?
Dimitri Mendeleev, widely referred as the father of the periodic table put forth the first iteration of the periodic table similar to the one we use now. Mendeleev’s periodic law is different from the modern periodic law in one main aspect.- Mendeleev modeled his periodic table on the basis of increasing atomic mass, whereas, the modern periodic law is based on the increasing order of atomic numbers.
List of Periodic Table Elements
All 118 elements of the Modern Periodic Tabe is listed below.
Periodic Table - FAQs
Ans. 118 Elements are present in the Periodic Table. As per the periodic law, the properties of Elements are periodic functions of their atomic numbers.
Ans. The structure for the contemporary periodic table was developed in 1869 by Russian chemist Dmitri Mendeleev, who left spaces for elements that had not yet been discovered.
Ans. A group is a column of elements in the periodic table of the chemical elements. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms.
Ans. The first 20 elements of the periodic table in order are:
H – Hydrogen
He – Helium
Li – Lithium
Be – Beryllium
B – Boron
C – Carbon
N – Nitrogen
O – Oxygen
F – Fluorine
Ne – Neon
Na – Sodium
Mg – Magnesium
Al – Aluminium
Si – Silicon
P – Phosphorus
S – Sulphur
Cl – Chlorine
Ar – Argon
K – Potassium
Ca – Calcium
H – Hydrogen
He – Helium
Li – Lithium
Be – Beryllium
B – Boron
C – Carbon
N – Nitrogen
O – Oxygen
F – Fluorine
Ne – Neon
Na – Sodium
Mg – Magnesium
Al – Aluminium
Si – Silicon
P – Phosphorus
S – Sulphur
Cl – Chlorine
Ar – Argon
K – Potassium
Ca – Calcium
Ans. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table consists of 18 vertical columns and 7 horizontal rows.
Ans. In 1669, phosphorus was the first element to be chemically discovered by Hennig Brandt.
Ans. There are four main periodic trends: electronegativity, atomic size, ionization energy, and electron affinity.
Ans. Henry Moseley discovered the atomic number in 1913 while analyzing X-ray spectra. He found that when the atomic number increases by one, certain lines in the X-ray spectra of atoms shift by the same amount each time.
Ans. Of the 118 elements in the current periodic table, there are 18 non-metals, 7 metalloids, and 93 metals.
Ans. The valence electron orbitals of the elements in the periodic table are used to group them into blocks. The four blocks are the s-block, p-block, d-block, and f-block.
