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प्रश्न
Fill in the blank
An ion with negative charge is called _______
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उत्तर
An ion with negative charge is called anion.
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
WRITE SHORT ANSWER
What is radioactivity?
Write the names of the elements present in the:-
Acetic acid
What are orbits or shells ?
State Dalton’s atomic theory.
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
What value has been given to the mass of this reference atom ?
State two observations which show that atom is not indivisible.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
K: Potassium:: C: ______.
Name the sub-atomic particles.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
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.
