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प्रश्न
Who originated the word ‘atom’ ?
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उत्तर
Democritus
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संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Fill in the blank:
Atoms are _____
Define: Relative atomic mass
Give two examples for each of ionic and covalent bond.
Name the particle or particles you would expect to find in :
The nucleus of an atom
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
An excess of electrons produces a ________ charge.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
In what respects do the three isotopes of hydrogen differ? Give their structures.
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.
K: Potassium:: C: ______.
Define – Atom.
Draw the structure of an atom and explain the position of the sub-atomic particles.
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.
______ is the smallest particle of an element.
A change in the physical state can be brought about
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
Lead is also known as plumbum.
