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प्रश्न
Define the following term with an example.
Non-metal
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उत्तर
Non-Metal: Non-metal is an element that doesn’t have the characteristics of metal including, (i.e.) ability to conduct heat or electricity luster or flexibility.
Ex. Carbon Iodine, Sulphur.
APPEARS IN
संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
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.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Write the names of `("NH"_4)_2"SO"_4` compounds:
Define: Ions
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Write the relation between nanometre and metre.
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
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?
The smaller particles found in the atom is called ______.
K: Potassium:: C: ______.
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.
Give the salient features of “Modern atomic theory”.
Does the solubility of a substance change with temperature? Explain with the help of an example.
