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प्रश्न
Name two elements in halogens.
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उत्तर
Chlorine and bromine.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
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
What is the usual number of valence electrons in the atoms of the last element in a period?
What are the periods in a periodic table? Give two characteristics of each.
What is the number of elements in the 3rd period, of the modern periodic table?
Name the cation and the anion in the salt – calcium sulphate
Give the chemical formula of calcium phosphate
Find the odd one out and give its explanation.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
