Advertisements
Advertisements
प्रश्न
Define the following term with an example.
Element
Advertisements
उत्तर
Element: It is a substance that cannot be broken down into simpler substance by chemical means
Ex.: Oxygen, Hydrogen, Gold & Helium.
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
Cathode rays are a stream of fast moving particles that travel in random directions.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Define:- Molecule
Write the names of `"FeS"` compounds :
Fill in the blank:
Atoms are _____
Name two particles found inside the nucleus. What are they collectively called ?
Name the particles which revolve around the nucleus.
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
How is the size of an atom indicated ?
State two observations which show that atom is not indivisible.
One nm is equal to :
Define the following term:
Atom
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the diagrams representing the atomic structures of the following: Neon
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 aluminium
K: Potassium:: C: ______.
Draw the structure of an atom and explain the position of the sub-atomic particles.
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.
Define the following term with an example.
Non-metal
Define the term ions or radicals.
Give the salient features of “Modern atomic theory”.
Which of the following has maximum number of atoms?
The ______ are combination of atoms of various elements or the same element.
Atoms have a radius of the order ______.
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 ______.
