Advertisements
Advertisements
प्रश्न
Define the following term with an example.
Metal
Advertisements
उत्तर
Metal: A chemical element that is an effective conductor of electricity and heat can be defined as a metal.
Ex.: Copper, Iron, Silver, etc.
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Fill in the blank
An ion with positive charge is called ______
Define: Mass number
Give the charge and the mass of an electron, proton and neutron present in an atom ?
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
What value has been given to the mass of this reference atom ?
Is it possible to see atoms these days ? Explain your answer.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
In what respects do the three isotopes of hydrogen differ? Give their structures.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
Name 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.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Atoms of different elements having the same number of ______ are called isotones.
The graphite refill used is pencil is made of element called ______.
