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Question
The elements from the zero group are called _______.
Options
alkali metals
alkaline earth metals
halogen
noble gases
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Solution
The elements from the zero group are called noble gases.
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The element eka-silicon in Mendeleev’s periodic table is known as ………… in the modern periodic table.
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(b) Ea3O2
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Eka boron : Scandium : : Eka Aluminum : _______
Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______
Find the odd one out and give its explanation.
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| Column A | Column B |
| 1) Eka-aluminium | a) Scandium |
| 2) Eka-Silicon | b) Gallium |
| 3) Eka- boron | c) Germanium |
| d) Beryllium |
Match the columns.
| Column A | Column B |
| 1) Triads | a) Mendeleev |
| 2) Octave | b) Dobereiner |
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| 4) Atomic mass number | d) Moseley |
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Write the name.
The family of group 1 elements.
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The family of elements having zero valency.
Write scientific reason.
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| Halogens | (b) Group 1 |
| Noble gases | (c) Group 17 |
