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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
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
What was the Mendeleev's basis for the classification of elements?
How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
Why did Mendeleev leave some gaps in his periodic table?
In Mendeleev's periodic table, gap was not left for one of the following elements. This element is:
(a) gallium
(b) beryllium
(c) germanium
(d) scandium
In Mendeleev's periodic table, gaps were left for the elements to be discovered later on. An element which found a vacant place in the periodic table later on is:
(a) Be
(b) Si
(c) Ge
(d) Se
Eka boron : Scandium : : Eka Aluminum : _______
Find the odd one out and give its explanation.
Write scientific reason.
In a group, the size of the atom increases as it goes down from the top.
Match the column:
| Column ‘A’ | Column ‘B’ |
| Alkali metals | (a) Group 18 |
| Halogens | (b) Group 1 |
| Noble gases | (c) Group 17 |
