Question

$A)$ State modern periodic table.
$B)$ How does the electronic configuration of the atom of an element relate to its position in the modern periodic table $?$
$C)$ How could the modern periodic law remove various anomalies of Mendeleev's periodic table? Explain with examples.
$D)$ Is it possible to have an element having atomic number $1.5$ placed between hydrogen and helium?
$E)$ Name the scientist who prepared the modern periodic table.

Answer 1

Hint : The modern table is based on Mendeleev’s table, except the modern table arranges the elements by increasing atomic number instead of atomic mass. Atomic number is the number of protons in an atom, and this number is unique for each element. The modern table has more elements than Mendeleev’s table because many elements have been discovered since Mendeleev’s time.

Complete Step By Step Answer:
$A)$ The modern periodic table is used to organize all the known elements. Elements are arranged in the table by increasing atomic number. In the modern periodic table, each element is represented by its chemical symbol. Columns of the periodic table are called groups. Elements in the same group have similar properties.
$B)$ The electronic configuration of an element is related to its position on the periodic table. The number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.
$C)$ Different anomalies of Mendeleev's Periodic Table eliminated as continues in the Modern Periodic Table. Elements are placed in the increasing order of their atomic number in the Modern Periodic Table, subsequently there was no requirement for keeping more than one component in one space.
$D)$ It is not possible to place an element with an atomic number of $1.5$ between hydrogen and helium. Atomic numbers are always whole numbers and cannot be in decimals, as half an electron or half a proton cannot exist.
$E)$ A scientist named Dmitri Mendeleev also saw the need to organize the elements. He created a table in which he arranged all of the elements by increasing atomic mass from left to right across each row.

Note :
There are some limitations of the modern periodic table Position of hydrogen: It could not assign a correct position to hydrogen in the table. The lanthanides and actinides are not placed in the main body of the table. And, Position of isotopes there are no separate positions for isotopes of an element.