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प्रश्न
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
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उत्तर
Elements contains two or more kinds of atoms and compounds contains two or more kinds of elements.
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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
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
Define:- Molecule
Write the names of the elements present in the:-
Acetic acid
What does an atom consist of ? Explain.
Name the particles which revolve around the nucleus.
Define: Covalent bond
What does the word ‘atom’ mean?
Fill in the blank
A deficiency of electrons produces a ________ charge.
Name the unit in which the radius of an atom is usually expressed.
State two observations which show that atom is not indivisible.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
The electron shell ______ is nearest to the nucleus.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
In what respects do the three isotopes of hydrogen differ? Give their structures.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Define the following term with an example.
Compound
Atoms of different elements having the same number of ______ are called isotones.
1 mole of Gold and Silver contain same number of atoms.
