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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

Draw the structure of an atom and explain the position of the sub-atomic particles. - Science

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प्रश्न

Draw the structure of an atom and explain the position of the sub-atomic particles.

संक्षेप में उत्तर

उत्तर

Structure of an atom.

Position of the subatomic – particles.
Atom consist of three sub-atomic.
Particles: 1. Protons, 2. Electrons, 3. Neutrons

  1. The nucleus of the atom contains the protons (positively charged) and the neutrons (no change)
  2. The outermost regions of the atom are called electron shells and contain the electrons (negatively charged)
  3. The protons have a positive charge while neutrons have a neutral charge.
  4. Electrons circle around the nucleus of an atom, they are negatively charged.
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अध्याय 4: Atomic Structure - Evaluation [पृष्ठ ५२]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
अध्याय 4 Atomic Structure
Evaluation | Q IX. 1. | पृष्ठ ५२

संबंधित प्रश्न

TRUE \ FALSE

Elements combine in definite proportions to form compounds.


TRUE \ FALSE

Cathode rays are a stream of fast moving particles that travel in random directions.


WRITE SHORT ANSWER

Name three inert gases.


Define:- Molecule


Write the names of `"Na"_3"PO"_4` compounds :


Fill in the blank

An ion with negative charge is called _______


Define: Relative atomic mass


 Name the particles which revolve around the nucleus.


Give two examples for each of ionic and covalent bond.


Name the particle or particles you would expect to find in :

The nucleus of an atom


Fill in the blank

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


Name the three subatomic particles present in an atom.


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 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?


Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.

(Atomic masses : Al = 27 u ; Fe = 25 u)


What is the contribution of the following in atomic structure?
Maharshi Kanada


Name the gas that.

Turns moist starch iodide paper blue black.


Draw the diagrams representing the atomic structures of the following: Neon


The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium


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


The basic unit of matter is ______.


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

An atom is electrically neutral.


Name the sub-atomic particles.


An element is composed of ______ atoms.


A change in the physical state can be brought about


You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?


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


Lead is also known as plumbum.


What are the 3 most abundant atoms on the earth?


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