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प्रश्न
Which particular atom of the above element is used for this purpose ?
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उत्तर
Carbon-12 atom is particularly used as a standard in the atomic mass scale.
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संबंधित प्रश्न
Give the names and symbols of five familiar substances which you think are elements.
Why is the symbol S for sulphur, but Na for sodium and Si for silicon?
Match the metallic elements – with their correct symbols Metallic elements
| Metallic elements | Symbol |
| (a) Potassium | (1) Ca |
| (b) Sodium | (2) Zn |
| (c) Calcium | (3) Pb |
| (d) Magnesium | (4) Hg |
| (e) Zinc | (5) Cu |
| (f) Aluminum | (6) Au |
| (g) Iron | (7) K |
| (h) Lead | (8) Fe |
| (i) Copper | (9) Al |
| (j) Mercury | (10) Na |
| (k) Silver | (11) Mg |
| (l) Platinum | (12) Pt |
| (m) Gold | (13) Ag |
Match the symbols of non-metallic elements with their correct combining power or capacity.
(a) O
(b) S
(c) Cl
Combining power or capacity A : 3; B : 2; C : 1. (negative valencies)
Give the symbol of the following element:
Potassium
State the type of element for the following:
Iodine
Give the formula of the following acid:
Hydrochloric
Name the following:
An acid whose formula is ‘H2CO3’.
Name three metals whose symbols are derived: from their Latin names.
Write a note on Greem symbols.
