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प्रश्न
State what is meant by the term chemical formula.
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उत्तर
Chemical formula is the representation of a substance by means of symbols.
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संबंधित प्रश्न
What is the name of those elements which divide metals and non-metals in the periodic table?
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Ammonium
The K and L shells of the elements Na and Mg contain electrons.
Distinguish between:
s-block - p-block
Which of the following elements would lose an electron easily?
Spot the error:
The elements of group 13 are called the carbon family.
