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प्रश्न
The smaller particles found in the atom is called ______.
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उत्तर
he smaller particles found in the atom is called sub-atomic particels.
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संबंधित प्रश्न
WRITE SHORT ANSWER
Name three inert gases.
Write the names of the elements present in the following compound.
Common salt
Fill in the blank:
Atoms are _____
Name three non-metals/radicals which have valency -1, -2, and -3.
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.
Find the mass of 2 moles of nitrogen atoms.
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Define the following term with an example.
Compound
Define the following term with an example.
Non-metal
Which of the following statements made by Dalton has not undergone any change?
______ is the smallest particle of an element.
In the nucleus of `""_20"Ca"^40`, there are ______
Give the salient features of “Modern atomic theory”.
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
Write any two observations which support the fact that atoms are divisible.
______ is a substance that is made up of three oxygen atoms chemically combined.
Lead is also known as plumbum.
The ______ are combination of atoms of various elements or the same element.
