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प्रश्न
Define the following term with an example.
Metalloid
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उत्तर
Metalloid: Metalloid is a chemical element that exhibits some properties of metals and some of non-metals. Metalloids are generally semi-conductors.
Ex.: Silicon. Arsenic, Antimony and Boron.
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संबंधित प्रश्न
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Define:- Molecule
Write the names of `"Ca"("NO"_3)_2` compounds :
Fill in the blank
An ion with negative charge is called _______
Who originated the word ‘atom’ ?
State Dalton’s atomic theory.
Name the unit in which the radius of an atom is usually expressed.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
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.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Define – Atom.
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.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
A change in the physical state can be brought about
The graphite refill used is pencil is made of element called ______.
What is the fundamental particle of an element?
The ______ are combination of atoms of various elements or the same element.
