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प्रश्न
How many periods and groups are there in the modern periodic table?
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उत्तर
Eighteen groups and seven periods
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संबंधित प्रश्न
State modern periodic law.
How were the positions of cobalt and nickel resolved in the modern periodic table?
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
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.
Name the noble gas with 3 shells.
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Name an element of group 18 which can form compounds.
Complete the following flow chart.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
