Advertisements
Advertisements
प्रश्न
Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The elements X and Y are most likely to be respectively :
विकल्प
copper and sulphur
sulphur and iron
phosphorus and nitrogen
nitrogen and iron
Advertisements
उत्तर
nitrogen and iron
Elements X and Y, most likely, are nitrogen and iron.
APPEARS IN
संबंधित प्रश्न
Write the names of following elements Na, C, Kr, U, Ra, Fe, Co.
Define atomic mass unit. What is its symbol ?
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
For writing a chemical formula – ‘symbols’ and combining capacity of an element with hydrogen i.e. ‘valency’ should be known. Explain the term – combining the capacity of an element i.e. valency.
State which element exists in the highest percentage in human body.
Write the chemical formula of the following:
zinc oxide
State the valency of the following metallic element and write symbol with the valency
Chromium
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).
Sulphide
Give the qualitative and quantitative meaning of the term ‘symbol’.
The pictorial symbol for water given by the alchemists was
