English

Write any two observations which support the fact that atoms are divisible.

Advertisements
Advertisements

Question

Write any two observations which support the fact that atoms are divisible.

Short/Brief Note
Advertisements

Solution

With the discovery of electrons and protons it was established that atom is divisible and is made up of negatively charged electrons and positively charged protons along with some neutral particles called neutrons.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Structure of the Atom - Short Answer Questions [Page 30]

APPEARS IN

NCERT Exemplar Science Exemplar [English] Class 9
Chapter 4 Structure of the Atom
Short Answer Questions | Q 20. | Page 30

RELATED QUESTIONS

Write the names of the elements present in the :- 

Sulphuric acid


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 such a particle called ?


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

Does the particle have an excess of electrons or a deficiency of electrons ?


Name the three subatomic particles present in an atom.


What are the building blocks of matter ?


What value has been given to the mass of this reference atom ?


The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.


Electron, proton, neutron are the types of ______ in an atom.


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 element will gain electron?


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


An element is composed of ______ atoms.


Atoms of one element can be transmuted into atoms of other elements by ______


Give the salient features of “Modern atomic theory”.


A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?


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


______ is a substance that is made up of three oxygen atoms chemically combined.


What are the 3 most abundant atoms on the earth?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×