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प्रश्न
Name the metalloids in the first twenty elements.
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उत्तर
B (Boron), Si (Silicon).
संबंधित प्रश्न
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
Name the type of elements which have one electron short of octet.
Give the chemical formula of calcium phosphate
The d-block elements are called as _______ elements.
To the left of the zig-zag line in the periodic table are the metal elements.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
Which of the following is the outermost shell for elements of period 2?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
