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प्रश्न
Name the metals in the first twenty elements.
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उत्तर
Li, Be, Na, Mg, Al, K and Ca.
संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
Name two elements in Alkaline earth metals.
Name two elements in each case:
Actinides
Name the type of elements which have two electrons in the outermost orbit.
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
______ is the longest period in the periodical table.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
