Question

The
(a)
(vi) The
(a
(vii) Ma
sun
neutron
(viii)
(ix)
PRACTICE ASSIGNMENT 4
(Based on Chapter 4 Atomic Structure)
1. Fill in the blank spaces by choosing the correct words from the list given below:
List :
electronic
configuration
nucleons
alpha particle
electron
number
nuclear radiation uranium accepted
(i) An
has negligible mass and unit negative charge.
(ii) A
has a mass equal to atom of hydrogen, but has no electric charge.
(iii) The arrangement of electrons around the nucleus of an atom, is called
(iv) The atomic
determines the nature of an element.
(v) The number of
present within the nucleus, is the atomic weight of an element.
(vi) The process by which an element ejects
from its nucleus spontaneously, is
called radioactivity.
(vii) A nuclei of 2 protons and 2 neutrons ejected from the nucleus of a radioactive element, is
called
(viii) During the process of nuclear fission, an atom of
splits with the release of energy.
(ix) Nuclear fusion of hydrogen takes place in the
(x) The number of electrons donated or
by an atom, so as to acquire a stable electronic
configuration of the nearest noble gas, is called valency.
2. Write correct word/words for the statements given in the list below :
List : Nucleus proton isotopes cation
nuclear fusion
orbit
valency ions
B-particle neutron
Word/Words
Statements
4.
5.
6.
(i) An assembly of protons and neutrons within an atom.
(ii) The path along which an electron moves around the nucleus.
(111) The number of electrons donated/accepted by an atom to have a stable valence shell.
(iv) Sharged particles are formed when an atom accepts/donates electrons from its valence shell.​

Answer 1

Answer:

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