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प्रश्न
Define the following term with an example.
Metal
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
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
Write the names of the elements present in the:-
Sodium hydroxide
Fill in the blank:
Atoms are _____
Define: Ions
Name two particles found inside the nucleus. What are they collectively called ?
What does the word ‘atom’ mean?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
If an atom gains an electron, it is called an _______
What is an atom ? How do atoms usually exist ?
Define the following term:
Atom
Electron, proton, neutron are the types of ______ in an atom.
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.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
The smallest particle of matter that can exist by itself is ______.
The basic unit of matter is ______.
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.
Metalloid
An element is composed of ______ atoms.
Define the term ions or radicals.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
The number of atoms present in a molecule is called its ______.
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?
Write any two observations which support the fact that atoms are divisible.
The graphite refill used is pencil is made of element called ______.
