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प्रश्न
An element is composed of ______ atoms.
उत्तर
An element is composed of same kind of atoms.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Molecule
Name two particles found inside the nucleus. What are they collectively called ?
Define: Covalent bond
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
Define: An Atom:
One nm is equal to :
The electron shell ______ is nearest to the nucleus.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Metal
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Does the solubility of a substance change with temperature? Explain with the help of an example.
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
The graphite refill used is pencil is made of element called ______.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
