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प्रश्न
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
उत्तर
Sodium (Na), magnesium (Mg) and aluminium (Al) belong to the same(third) period of the periodic table.
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संबंधित प्रश्न
How many rows and columns are there in the Modem Periodic Table?
Explain why, the noble gases are placed in a separate group.
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Potassium
Which of the following statements about the Modern periodic table is correct?
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
Define groups of modern periodic table.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
