SSC Worksheet for Chapter - 1 Structure of an Atom Class 8

Worksheets For class 8

Find SSC Worksheet for chapter-1 Structure of an Atom class 8

1. CLASS-8
2. BOARD: SSC
3. Chemistry Worksheet - 1
4. TOPIC: Structure of an Atom
5. For other SCC Worksheet for class 8 Sciencecheck out main page of Physics Wallah.

1. Electrons resides inside_________ in an atom.
   1. nucleus
   2. space between nucleus and periphery
   3. depends whether atom is in reacted state or not
   4. cannot say
2. Neutrality of an Atom was first explained by_____________.
3. Position and size of nucleus was ascertained by ___________.
4. A positively charged Na⁺ atom has 11 protons and 10 electrons. Its atomic number is ________.
5. Which positively charged Hydrogen isotope is a proton
   1. protium
   2. Deutrium
   3. Tritum
   4. All of these
6. Isotopes has same _________ and different __________.
7. An element is characterized by
   1. No. of electrons in its atom
   2. No. of proton in its atom
   3. No. Of neutrons in its atom
   4. all of them
8. Boron has 5 electrons out of which 2 electrons are in 1^st orbit 3 electrons in 2^nd orbit (outer most orbit). Valency of Boron is___________.
9. Valency of calcium (Ca) is 2 and Nitrogen (N) is 3. What is expected chemical formula for compound of calcium and nitrogen.
10. Number of electrons that can reside inK shell is __________.

Descriptive:

1. Explain Rutherford experiment postulates.
2. Explain drawbacks of Rutherford prostitutes.
3. What are nucleons.
4. Define Atomic number?
5. Explain Valency of an element.

Solutions: to worksheet-1 Topic-Structure of an Atom

1. b
2. J. J. Thomson
3. Emust Rutherford
4. 11
5. a
6. Atomic Number, Atomic Mass
7. b
8. a
9. Ca₁N₂
10. 2
11. The postulates are:
    1. The nucleus at the centre of the atom has positive charge and most of the mass is concentrated is nucleus.
    2. The negatively changed elections revolve around the nucleus in a specific orbit.
    3. In compassion is the size of the atom, nucleus is very small.
12. Drawback Electrons moving is the orbit will louse energy due to attraction of positively changed nucleus and its path will gratuity shrink and will fall into nucleus lead to collapse of the atom.
13. The subatomic particles resting inside the nucleus of any atom are termed as nucleons. Ex : proton, nutrition, portions etc.
14. The number of protons in the nucleus of an atom is the atoms number of that particulars atom. In unreacted state number of points are equal to number is sometimes also explained in terms of number of electrons.
15. The combining capacity of an atom is known as its valency.