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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

A Certain Particle ‘X’ Has 17 Protons, 18 Electrons and 20 Neutrons. What is Such a Particle Called ?

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प्रश्न

A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is such a particle called ?

एक पंक्ति में उत्तर
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उत्तर

What is such a particle called= anion

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अध्याय 4: Atomic Structure - Additional questions

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atomic Structure
Additional questions | Q 22.1

संबंधित प्रश्न

TRUE \ FALSE

Elements having a tendency to accept electrons are called metals

 


Write the names of the elements present in the :- 

Sulphuric acid


Write the names of `"FeS"` compounds :


What does the word ‘atom’ mean?


Fill in the blank

If an atom loses an electron, it acquires ______ a charge.


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.


Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.


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.


Give scientific reason.

All the mass of an atom is concentrated in the nucleus.


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?


A compound containing one atom of carbon and two atoms of oxygen is ______.


State true or false. If false, correct the statement.

An atom is electrically neutral.


Name 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.


The volume occupied by 1 mole of a diatomic gas at S.T.P is ______


In the nucleus of `""_20"Ca"^40`, there are ______


Give the salient features of “Modern atomic theory”.


______ is a substance that is made up of three oxygen atoms chemically combined.


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 ______.


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