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प्रश्न
Match the atomic number with the following:
A rare gas.
विकल्प
19
15
8
4
2
उत्तर
2
संबंधित प्रश्न
How were the positions of cobalt and nickel resolved in the modern periodic table?
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.
What are the groups in a periodic table? Give two characteristics of each.
How does the electronic configuration of an atom relate to its position in the modern periodic table?
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?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Give the symbol and valency of the following element and radical.
Nitrate
The groups 1 and 2 constitute the _______ block.
Noble gases belong to______ group of the periodic table.
An element which is an essential constituent of all organic compounds belongs to
