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प्रश्न
Name the gas that.
Turns moist starch iodide paper blue black.
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उत्तर
Chlorine.
APPEARS IN
संबंधित प्रश्न
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 |
WRITE SHORT ANSWER
What is radioactivity?
Write the names of `"Na"_3"PO"_4` compounds :
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
What are the 3 most abundant atoms on the earth?
