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प्रश्न
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
उत्तर
Both helium (He) and neon (Ne) have filled outermost shells. Helium has a duplet in its K shell, while neon has an octet in its L shell.
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संबंधित प्रश्न
Name three elements that have a single electron in their outermost shells.
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
State whether the following statement is true of false:
According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic numbers.
State Mendeleev's periodic law.
Write the merits of Mendeleev’s periodic table.
How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?
Beryllium : alkaline earth metal : : sodium: _______
What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?
Which of the following statement (s) about the Modern Periodic Table are incorrect
- The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
- The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
- Isotopes are placed in adjoining group (s) in the Periodic Table
- The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
Give an account of the process adopted by Mendeléev for the classification of elements. How did he arrive at “Periodic Law”?
