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प्रश्न
What value has been given to the mass of this reference atom ?
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उत्तर
Carbon-12 atom has been given a mass of exactly 12 units (`""^12"_6C` has six protons and six neutrons).
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 |
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
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Common salt
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Define: Mass number
Give two examples for each of ionic and covalent bond.
Who originated the word ‘atom’ ?
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Name the particle or particles you would expect to find in :
The nucleus of an atom
Fill in the blank
A deficiency of electrons produces a ________ charge.
Why is it not possible to see an atom even with the most powerful microscope ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
______ is the smallest particle of an element.
What is the fundamental particle of an element?
What are the 3 most abundant atoms on the earth?
