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Question
Write the names of the elements present in the following compound.
Common salt
Solution
Sodium chloride
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| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
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TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Molecule
Fill in the blank:
Atoms are _____
Define: Relative atomic mass
Name the particles which revolve around the nucleus.
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Fill in the blank
An excess of electrons produces a ________ charge.
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.
Electron, proton, neutron are the types of ______ in an atom.
The electron shell ______ is nearest to the nucleus.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Give the salient features of “Modern atomic theory”.
A change in the physical state can be brought about
______ is a substance that is made up of three oxygen atoms chemically combined.
Atoms have a radius of the order ______.
