Among the first ten elements, lithium (Li) and beryllium (Be) are metals. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Among the first ten elements, lithium (Li) and beryllium (Be) are metals.
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. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
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.
Yes. The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shells. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Yes. The atoms of all the three elements lithium, sodium, and potassium have one
electron in their outermost shells.
Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells.
Calcium (Ca) and strontium (Sr) are expected to show chemical reactions similar to magnesium (Mg). This is because the number of valence electrons (2) is same in all these three elements. And since chemical properties are due to valence electrons, they show same chemical reactions. For more answersRead more
Calcium (Ca) and strontium (Sr) are expected to show chemical reactions similar to magnesium (Mg). This is because the number of valence electrons (2) is same in all these three elements. And since chemical properties are due to valence electrons, they show same chemical reactions.
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 explainRead more
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.
Noble gases are inert elements. Their properties are different from the all other elements. Therefore, the noble gases are placed in a separate group. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Noble gases are inert elements. Their properties are different from the all other elements.
Therefore, the noble gases are placed in a separate group.
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals. For more answerRead more
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals.
Limitations of Newlands’ law of octaves: a) It was not applicable throughout the arrangements. It was applicable up to calcium only. The properties of the elements listed after calcium showed no resemblance to the properties of the elements above them. b) Those elements that were discovered after NeRead more
Limitations of Newlands’ law of octaves:
a) It was not applicable throughout the arrangements. It was applicable up to calcium
only. The properties of the elements listed after calcium showed no resemblance
to the properties of the elements above them.
b) Those elements that were discovered after Newlands’ octaves did not follow the
law of octaves.
c) The position of cobalt and nickel in the group of the elements (F, Cl) of different
properties could not be explained.
d) Placing of iron far away from cobalt and nickel, which have similar properties as
iron, could also not be explained.
In the Modern Periodic Table, which are the metals among the first ten elements?
Among the first ten elements, lithium (Li) and beryllium (Be) are metals. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Among the first ten elements, lithium (Li) and beryllium (Be) are metals.
For more answers visit to website:
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Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
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. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
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.
For more answers visit to website:
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Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
Yes. The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shells. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Yes. The atoms of all the three elements lithium, sodium, and potassium have one
electron in their outermost shells.
For more answers visit to website:
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Name two elements that have two electrons in their outermost shells.
Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells.
For more answers visit to website:
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Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Calcium (Ca) and strontium (Sr) are expected to show chemical reactions similar to magnesium (Mg). This is because the number of valence electrons (2) is same in all these three elements. And since chemical properties are due to valence electrons, they show same chemical reactions. For more answersRead more
Calcium (Ca) and strontium (Sr) are expected to show chemical reactions similar to magnesium (Mg). This is because the number of valence electrons (2) is same in all these three elements. And since chemical properties are due to valence electrons, they show same chemical reactions.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
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 explainRead more
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Why do you think the noble gases are placed in a separate group?
Noble gases are inert elements. Their properties are different from the all other elements. Therefore, the noble gases are placed in a separate group. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Noble gases are inert elements. Their properties are different from the all other elements.
Therefore, the noble gases are placed in a separate group.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
What were the criteria used by Mendeleev in creating his Periodic Table?
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals. For more answerRead more
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
Scandium and germanium For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Scandium and germanium
For more answers visit to website:
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What were the limitations of Newlands’ Law of Octaves?
Limitations of Newlands’ law of octaves: a) It was not applicable throughout the arrangements. It was applicable up to calcium only. The properties of the elements listed after calcium showed no resemblance to the properties of the elements above them. b) Those elements that were discovered after NeRead more
Limitations of Newlands’ law of octaves:
a) It was not applicable throughout the arrangements. It was applicable up to calcium
only. The properties of the elements listed after calcium showed no resemblance
to the properties of the elements above them.
b) Those elements that were discovered after Newlands’ octaves did not follow the
law of octaves.
c) The position of cobalt and nickel in the group of the elements (F, Cl) of different
properties could not be explained.
d) Placing of iron far away from cobalt and nickel, which have similar properties as
iron, could also not be explained.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/