Question

sun
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
nucleons
configuration
electron
alpha particle
number nuclear radiation uranium accepted
neutron
(1) 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
Statements
Word/Words
(i) An assembly of protons and neutrons within an atom,
(ii) The path along which an electron moves around the nucleus.​

Answer 1

Answer:

1.

1. electron
2. neutron
3. electronic configuration
4. atomic number
5. nucleons
6. radiation
7. alpha particle
8. uranium
9. sun
10. valency