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प्रश्न
Name the elements in Period 1.
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उत्तर
Names of elements are (H) Hydrogen and Helium (He).
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संबंधित प्रश्न
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic character
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides
How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?
The atomic number of an element is 20. In modern periodic table, this element is placed:
(a) 2nd period
(b) 4th period
(c) 3rd period
(d) 1st period
Name the element of lower nuclear charge out of Be and Mg.
What is modern periodic law?
What is meant by periodicity of elements?
Formula of ion of A is A2+. Element A probably belongs to ______ group.
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
State the property trends in general of elements on moving down in a group of the periodic table.
Name or state following with reference to the element of the first three periods of the periodic table.
A covalent compound formed between an element in period 1 and a halogen.
