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प्रश्न
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
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उत्तर
Do it yourself.
APPEARS IN
संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
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.
Define: Chemical bond
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Name the three subatomic particles present in an atom.
How is the size of an atom indicated ?
Name the unit in which the radius of an atom is usually expressed.
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
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.
The number of atoms present in a molecule is called its ______.
Write any two observations which support the fact that atoms are divisible.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
