How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table ?
How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table ?
Mendeleev was unable to give fixed position to hydrogen and isotopes in the periodic table. In Mendeleev’s periodic table, the increasing manner of atomic mass of the elements is not always regular from one to its next. It was believed that a more fundamental property than atomic mass could explain periodic properties in a better manner.
It was Henry Moseley who demonstrated that atomic number of an element could explain periodic properties in a better way than atomic mass of an element and arranged the elements in increasing order of their atomic numbers. Then it was found that the various anomalies of Mendeleev’s periodic table were removed by the modern periodic table.
Similar Questions
Name
$(a)$ three elements that have a single electron in their outermost shells.
$(b)$ two elements that have two electrons in their outermost shells.
$(c)$ three elements with filled outermost shells.
Name
$(a)$ three elements that have a single electron in their outermost shells.
$(b)$ two elements that have two electrons in their outermost shells.
$(c)$ three elements with filled outermost shells.
An atom has electronic configuration $2$, $8$, $7$.
$(a)$ What is the atomic number of this element ?
$(b)$ To which of the following elements would it be chemically similar ?(Atomic numbers are given in parentheses.)
$N(7)$ $F(9)$ $P(15)$ $Ar(18)$
An atom has electronic configuration $2$, $8$, $7$.
$(a)$ What is the atomic number of this element ?
$(b)$ To which of the following elements would it be chemically similar ?(Atomic numbers are given in parentheses.)
$N(7)$ $F(9)$ $P(15)$ $Ar(18)$
Nitrogen (atomic number $7$) and phosphorus (atomic number $15$) belong to group $15$ of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Nitrogen (atomic number $7$) and phosphorus (atomic number $15$) belong to group $15$ of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements ?
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements ?