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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Define :- Molecule

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प्रश्न

Define:- Molecule

परिभाषा
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उत्तर

Molecule : Molecule is the smallest unit of a compound (or an element) which always has an independent existance.

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अध्याय 4: Atomic Structure - Exercise

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atomic Structure
Exercise | Q 1.2

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


Define: Covalent bond


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


An atom has 13 protons and 14 neutrons.

What is the atomic mass of the atom ?


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

What is the charge on the particle ?


Fill in the following blanks with suitable words :

In water, the proportion of oxygen and hydrogen is .............. by mass.


An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?


Find the mass of 2 moles of nitrogen atoms.


Match the pairs.

Group 'A' Group 'B'
a. Proton i. Negatively charged
b. Electron ii. Neutral
c. Neutron iii. Positively charged

Elements X and Y have 1 and 7 electrons in their outermost shell respectively.

Which will form positive ion?


The smallest particle of matter that can exist by itself is ______.


Define the following term with an example.

Element 


Define – Atom.


Define the following term with an example.

Metalloid


Which of the following statements made by Dalton has not undergone any change?


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


An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.


The first scientific theory about atoms was given by J J. Thomson.


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