Advertisements
Advertisements
प्रश्न
The smallest particle of matter that can exist by itself is ______.
Advertisements
उत्तर
The smallest particle of matter that can exist by itself is atom.
APPEARS IN
संबंधित प्रश्न
WRITE SHORT ANSWER
Define an ionic compound.
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the:-
Sodium hydroxide
Write the names of `("NH"_4)_2"SO"_4` compounds:
Write the names of `"Na"_3"PO"_4` compounds :
Define: Ions
Name the particle or particles you would expect to find in :
The nucleus of an atom
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Name the three subatomic particles present in an atom.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose 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.
Which of the following statements made by Dalton has not undergone any change?
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?
The first scientific theory about atoms was given by J J. Thomson.
