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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

Name the sub-atomic particles.

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प्रश्न

Name the sub-atomic particles.

एक पंक्ति में उत्तर
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उत्तर

Proton, Electron, Neutrons.

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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 VII. 2. | पृष्ठ ५२

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

Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?


Write the names of `"FeS"` compounds :


Who originated the word ‘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.


State two observations which show that atom is not indivisible.


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?


Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.


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)


Define the following term:

Atom


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


State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.


The basic unit of matter is ______.


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

An atom is electrically neutral.


Project.

To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.


Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars. 


Give the salient features of “Modern atomic theory”.


A change in the physical state can be brought about


Lead is also known as plumbum.


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