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प्रश्न
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
उत्तर १
Yes. The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shells.
उत्तर २
Lithium, sodium and potassium are all metals which belong to group 1, and have 1 valence electron in their atoms. They all have the same electronic configuration. Therefore, each element shows similar chemical properties when reacting with water and liberates hydrogen gas.
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संबंधित प्रश्न
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
(a) Write its electronic configuration and determine its valency.
(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.
(c) Is it a metal or a non-metal?
(d) Write the formula of its oxide.
Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.
Which group of elements was missing from Mendeleev's original periodic table?
How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?
In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?
At the time of Mendeleev, the number of elements known was ______
On moving from left to right in a period in the periodic table, the size of the atom.
