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प्रश्न
What is an atom ? How do atoms usually exist ?
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उत्तर
Atoms are building blocks of all matter. They are the smallest particles of elements that can take part in a chemical reaction.
Atoms usually exist in combined form, in two ways:
- in the form of molecules
- in the form of ions
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संबंधित प्रश्न
WRITE SHORT ANSWER
Name three inert gases.
Write the names of the elements present in the:-
Glucose
Write the names of `"Na"_3"PO"_4` compounds :
What are orbits or shells ?
Name the particle or particles you would expect to find in :
The orbit of an atom
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Name the unit in which the radius of an atom is usually expressed.
How many times is a proton heavier than an electron?
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
What is the contribution of the following in atomic structure?
Maharshi Kanada
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
What will be the charge present of the molecule XY after chemical combination?
Define the following term with an example.
Element
The basic unit of matter is ______.
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.
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.
Define the following term with an example.
Metalloid
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.
The ______ are combination of atoms of various elements or the same element.
