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प्रश्न
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
उत्तर
- The periodic table is based on the atomic number of an element.
- Furthermore, the valence electrons determine their position in the group.
- Elements with one valence electron are classified as the first group, elements with two valence electrons as the second group, and vice versa.
- An element with 8 valence electrons belongs to the Periodic Table's last group (18th group) (excluding He).
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Name two elements in each case: Lanthanides
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
What is the number of elements in the 1st period?
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.
State the number of elements in Period 3 of the Periodic Table.
The d-block elements are called as _______ elements.
The modern periodic table has 1 to 7 periods.
