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प्रश्न
How many groups and periods does the modern periodic table have?
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उत्तर
The modern periodic table consists of seven horizontal rows and eighteen vertical columns.
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संबंधित प्रश्न
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
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
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
Give the symbol and valency of the following element and radical.
Sodium
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
What are the periods in a periodic table?
Find the odd one out and give its explanation.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
On moving from left to right in a period in the periodic table, the size of the atom ______
Which one of the following elements exhibit maximum number of valence electrons?
