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प्रश्न
What are the building blocks of matter ?
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उत्तर
Atoms and molecules are the building blocks of matter.
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संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Fill in the blank:
Atoms are _____
Fill in the blank
An ion with positive charge is called ______
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: Covalent bond
Give two examples for each of ionic and covalent bond.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
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.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Name the gas that.
Turns moist starch iodide paper blue black.
Define the following term with an example.
Element
Draw the structure of an atom and explain the position of the sub-atomic particles.
In the nucleus of `""_20"Ca"^40`, there are ______
The number of atoms present in a molecule is called its ______.
Give the salient features of “Modern atomic theory”.
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
Write any two observations which support the fact that atoms are divisible.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
