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प्रश्न
Give the symbol and valency of the following element and radical.
Calcium
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उत्तर
| Element/Radical | Symbol | Valency |
| Calcium | Ca | two |
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Explain why, the noble gases are placed in a separate group.
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 an element of group 18 which can form compounds.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Sodium
Give the symbol and valency of the following element and radical.
Sulphate
How does the property vary in periods and in groups?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
Name the non-metals in the first twenty elements.
