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प्रश्न
Write the names of following elements Na, C, Kr, U, Ra, Fe, Co.
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उत्तर
| Symbol | Element |
| Na | Sodium |
| C | Carbon |
| Kr | Krypton |
| U | Uranium |
| Ra | Radium |
| Fe | Iron |
| Co | Cobalt |
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संबंधित प्रश्न
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 |
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
State which element exists in the highest percentage in atmosphere.
State which element exists in the highest percentage in human body.
Give the symbol of the following element:
Carbon
Give the symbol of the following element:
Chlorine [chloride]
Give the symbol of the following element:
Bromine [bromide]
State what is meant by the term ‘activity series of metals’.
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Phosphate
Which letter is never used in any element symbol?
