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प्रश्न
Write the names of `"Na"_3"PO"_4` compounds :
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उत्तर
`"Na"_3"PO"_4` - Sodium Phosphate
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संबंधित प्रश्न
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
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
Define an ionic compound.
Fill in the blank:
Atoms are _____
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Fill in the blank
An excess of electrons produces a ________ charge.
How many times is a proton heavier than an electron?
Which of the following statement is correct about the atom of an element ?
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Name the gas that.
Turns moist starch iodide paper blue black.
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
Name the sub-atomic particles.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Compound
______ is the smallest particle of an element.
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
______ is a substance that is made up of three oxygen atoms chemically combined.
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below:
