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प्रश्न
What is variable valency? Name two elements having variable valency and state their valencies.
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उत्तर
Variable valency: Some elements exhibit more than one valency. They are said to have variable valency, e.g. Iron, copper, tin, lead.
Iron Fe Fe2+ or Fe3+
Copper cu cu+ or cu2+
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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
Multiple Choice Questions
The sub atomic particle with negative charge is
What are the two main features of Rutherford’s atomic model?
Name the particles which actually determine the mass of an atom.
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Oxygen – \[\ce{^16_8O}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.
Explain the following terms.
- Proton
- Electron
- Neutron.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
