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प्रश्न
Name three non-metals/radicals which have valency -1, -2, and -3.
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उत्तर
-1 = Chlorine, Bromine, Iodine.
-2 = Oxide, Sulphide, Sulphate.
-3 = Nitrogen, Nitride Phosphate.
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संबंधित प्रश्न
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?
Define:- Radicals
Define: Chemical bond
Name the particles which revolve around the nucleus.
Define: Covalent bond
State Dalton’s atomic theory.
Define: An Atom:
Fill in the blank
A deficiency of electrons produces a ________ charge.
Write the full form of IUPAC.
State two observations which show that atom is not indivisible.
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
A compound containing one atom of carbon and two atoms of oxygen is ______.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
State true or false. If false, correct the statement.
An atom is electrically neutral.
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 the same number of ______ are called isotones.
The graphite refill used is pencil is made of element called ______.
Lead is also known as plumbum.
