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प्रश्न
Elements in the modern periodic table are arranged in ______groups and______ periods.
विकल्प
7, 18
18, 7
17, 8
8, 17
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उत्तर
Elements in the modern periodic table are arranged in 18 groups and 7 periods.
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संबंधित प्रश्न
Give two example of group 18 elements.
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Which element has the electronic configuration 2, 8, 2?
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
Explain why all the elements of a period have different chemical properties.
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.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Which one of the following elements exhibit maximum number of valence electrons?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
