Advertisements
Advertisements
Question
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Solution
First Shell (K) = 2, Second Shell (L) = 8, Third Shell (M) = 18, Fourth (d) = 8, Shell (N) = 32
APPEARS IN
RELATED QUESTIONS
Why is it not possible to see an atom with naked eyes?
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the:-
Acetic acid
Name the particles which revolve around the nucleus.
Define: An Atom:
Fill in the blank
If an atom gains an electron, it is called an _______
Find the mass of 2 moles of nitrogen atoms.
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
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
In what respects do the three isotopes of hydrogen differ? Give their structures.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Draw the structure of an atom and explain the position of the sub-atomic particles.
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.
Define the following term with an example.
Metal
Define the following term with an example.
Non-metal
The number of atoms present in a molecule is called its ______.
What are the 3 most abundant atoms on the earth?
