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प्रश्न
Define the following term with an example.
Element
उत्तर
Element: It is a substance that cannot be broken down into simpler substance by chemical means
Ex.: Oxygen, Hydrogen, Gold & Helium.
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Fill in the blank:
Atoms are _____
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Name three non-metals/radicals which have valency -1, -2, and -3.
Name the particle or particles you would expect to find in :
The orbit of an atom
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
Is it possible to see atoms these days ? Explain your answer.
State two observations which show that atom is not indivisible.
What is an atom ? How do atoms usually exist ?
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.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Draw the diagrams representing the atomic structures of the following: Neon
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.
The smaller particles found in the atom is called ______.
K: Potassium:: C: ______.
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.
Define the following term with an example.
Metalloid
An element is composed of ______ atoms.
The volume occupied by 4.4 g of CO2 at S.T.P ______
Lead is also known as plumbum.
What are the 3 most abundant atoms on the earth?
The ______ are combination of atoms of various elements or the same element.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
