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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Write the Names of the Elements Present in the :- Sodium Hydroxide - Chemistry

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प्रश्न

Write the names of the elements present in the:-

Sodium hydroxide

एक पंक्ति में उत्तर

उत्तर

Sodium hydroxide : Sodium, oxygen, hydrogen.

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अध्याय 4: Atoms, Molecules and Radicals - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atoms, Molecules and Radicals
Exercise | Q 2.5

संबंधित प्रश्न

If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.


ANSWER IN DETAIL

How are isobars different from isotopes ?


Write the names of the elements present in the:-

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Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.


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

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What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?


Why is it not possible to see an atom even with the most powerful microscope ?


What value has been given to the mass of this reference atom ?


An atom of an element X may be written as `""_9^4"X"`
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(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)


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

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


Atoms of one element can be transmuted into atoms of other elements by ______


A change in the physical state can be brought about


Write any two observations which support the fact that atoms are divisible.


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