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प्रश्न
What property do all elements in the same column of the Periodic Table as boron have in common?
उत्तर १
Valency equal to 3.
उत्तर २
All elements in the same column of the periodic table as boron have the same valency of 3.
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संबंधित प्रश्न
Why do you think the noble gases are placed in a separate group?
How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?
What property do all elements in the same column of the Periodic Table as fluorine have in common?
In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?
Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.
Describe two anomalies of Mendeleev's periodic classification of elements.
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.
(a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon
(b) Mention the period/periods of these elements in the modern periodic table.
(c) Write the group/ groups of these elements in the modern periodic table.
(d) Classify these elements as metals, non-metals or metalloids.
(e) How many valence electrons are present in the atoms of each of these elements?
Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______
Find the odd one out and give its explanation.
Match the column:
| Column ‘A’ | Column ‘B’ |
| Alkali metals | (a) Group 18 |
| Halogens | (b) Group 1 |
| Noble gases | (c) Group 17 |
