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प्रश्न
Answer the following question:
Name two elements having a single electron in their outermost shell.
उत्तर
Hydrogen and sodium are two elements that have a single electron in their outermost shell.
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संबंधित प्रश्न
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, Al, Si, Ba.
Name three elements with filled 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 any three demerits of Mendeleev’s periodic table.
On what basis elements are arranged in periodi table now?
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.
What were the two criteria used by Mendeleev to classify the elements in his periodic table?
What chemical properties of elements were used by Mendeleev in creating his periodic table?
Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.
Write a short note.
Mendeleev’s periodic law.
State Mendeleev's periodic law.
Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.
Use Mendeleev's Periodic Table to predict the formula of oxides of potassium, aluminum, and barium.
Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.
Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.
How many elements were known at the time of Mendeleev's classification of elements?
What are the demerits of Mendeleev’s periodic table?
How did Mendeleev arrange the elements in the periodic table?
What was the basis of Mendeleev's classification?
Give a reason for the following:
Mendeleev's contributions to the periodic table laid the foundation for the Modern Periodic Table.
According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.
While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.
Write scientific reason.
There was no definitive place for isotope in Mendeleev’s periodic table.
What are the limitations of Mendeleev's periodic table?
The properties of eka-aluminum predicted by Mendeleev are the same as the properties of a later discovered elements: ______
Which of the following properties does not match the element of the halogen family?
According to Mendeléev's Periodic Law, the elements were arranged in the periodic table in the order of
On moving from left to right in a period in the periodic table, the size of the atom.
Mendeléev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
- Name the elements which have taken the place of these elements
- Mention the group and the period of these elements in the Modern Periodic Table.
- Classify these elements as metals, non-metals or metalloids
- How many valence electrons are present in each one of them?
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
List the features of Mendeleev’s Periodic Table.
Name the elements whose compounds formed the basis of classification in Mendeleev's periodic table. Why did Mendeleev choose these elements?
How the formulae of these compounds had helped Mendeleev in deciding the position of an element in his periodic table?
