Advertisements
Advertisements
Question
Why is it not possible to see an atom with naked eyes?
Advertisements
Solution
The size of an atom is so small that it is not possible to see it with the naked eye. Also, an element's atom does not exist independently (its atomic radius is of the order of 10-10 m).
RELATED QUESTIONS
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
Write the names of the elements present in the following compound.
Common salt
Write the names of `("NH"_4)_2"SO"_4` compounds:
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
An _______ is electrically neutral.
Write the full form of IUPAC.
Name the three subatomic particles present in an atom.
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?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Electron, proton, neutron are the types of ______ in an atom.
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.
The volume occupied by 4.4 g of CO2 at S.T.P ______
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Does the solubility of a substance change with temperature? Explain with the help of an example.
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
