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7th Standard
TN 7th Tamil рокро░рпБро╡роорпН -1 роЗропро▓рпН 1 - роЕроорпБродродрпНродрооро┐ро┤рпН - роТройрпНро▒ро▓рпНро▓ роЗро░рогрпНроЯро▓рпНро▓ Important Questions And Answers Study Material - QB365 Set A
NEW7th Standard
TN 7th Tamil рокро░рпБро╡роорпН -1 роЗропро▓рпН 1 - роЕроорпБродродрпНродрооро┐ро┤рпН - роОроЩрпНроХро│рпН родрооро┐ро┤рпН Important Questions And Answers Study Material - QB365 Set A
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Published on: 18/09/2019
Atomic Structure
Download Tamil Nadu 7th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
What is isotone?
2.
What is an electron?
3.
What are valence electrons?
4.
What is a neutron?
5.
What is atomic number?
6.
Why neutrons called neutral particles?
7.
What is the characteristics of proton?
8.
What is atomic number?
9.
Name the sub-atomic particles.
10.
Define - Atom.
1.
Atoms of different elements with different atomic number and different mass numbers but the same number of neutrons are called isotones.
2.
It is negatively charged particle, which revolve around the nucleus of the atom is specific orbits.
3.
The number of electrons present in the outermost shell of an atom are known as valence electrons
4.
Neutron is an elementary particle that carries no charge
5.
Atomic number is the number of protons, an atom contains
6.
The total negative charge of all the electrons outside the nucleus is equal to the total positive charge of all the protons inside the nucleus. This makes the atoms electrically neutral. That is, nuclear charge is the total charge of the protons only. Therefore, neutrons are called as neutral particles.
7.
(i) One of the nucleon located in the nucleus.
(ii) Positively charged particle (+1).
(iii) Mass of a proton is 1.6726 \(\times\) 10-27 kg.
8.
The number of electrons or protons is an atom is called the atomic number (Z) of an atom.
9.
Protons, neutrons and electrons.
10.
An atom is the smallest particle of a chemical element that retains its chemical properties.
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
