Advertisements
Advertisements
Question
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Advertisements
Solution
6.022 × 1023 atoms are present in 12g of carbon-12 element.
APPEARS IN
RELATED QUESTIONS
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
WRITE SHORT ANSWER
Define an ionic compound.
Write the names of `"Na"_3"PO"_4` compounds :
Name the particle or particles you would expect to find in :
The orbit of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
If an atom gains an electron, it is called an _______
One nm is equal to :
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Which of the following statement is correct about the atom of an element ?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
What is the contribution of the following in atomic structure?
Maharshi Kanada
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Draw the electron dot structure of this compound.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Define the following term with an example.
Metal
Atoms of one element can be transmuted into atoms of other elements by ______
Lead is also known as plumbum.
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 ______.
