Advertisements
Advertisements
प्रश्न
Write the radical of the following valency:
Oxygen
पर्याय
1+
2+
3+
1−
2−
3−
Advertisements
उत्तर
2−
APPEARS IN
संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Match the non-metallic elements – with their correct symbols. Non-metallic elements are:
| Non-Metallic elements | Symbol |
| (a) Carbon | (1) O |
| (b) Chlorine | (2) I |
| (c) Oxygen | (3) Si |
| (d) Phosphorus | (4) C |
| (e) Hydrogen | (5) Cl |
| (f) Nitrogen | (6) P |
| (g) Iodine | (7) F |
| (h) Bromine | (8) H |
| (i) Fluorine | (9) S |
| (j) Silicon | (10) Br |
| (k) Sulphur | (11) N |
Give the symbol and the number of atoms of the following elements present in carbon dioxide.
Give the symbol and the number of atoms of the following elements present in zinc chloride.
State which element exists in the highest percentage in human body.
State the type of element for the following:
Chlorine
State what is meant by the term ‘activity series of metals’.
Give the formula of the following gas:
Carbon monoxide
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).
Oxide
Name three metals whose symbols are derived: from their Latin names.
