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प्रश्न
Name two elements in Alkali metals.
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उत्तर
Sodium and potassium.
संबंधित प्रश्न
How many rows and columns are there in the Modem Periodic Table?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
State how the valency of elements varies in a period of the periodic table?
Name two elements in halogens.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Give the symbol and valency of the following element and radical.
Carbonate
Explain structure of modern periodic table in short.
