Page 1 - 4.HOME ASSIGNMENT-(BOHR BURRY SCHEME,DISTRIBUTION OF ELECTRONS IN VARIOUS SHELLS)

SAI International School
Class-IX
Subject-Chemistry
Topic-Structure of atom
Sub topic- Bohr Burry scheme, Distribution of electrons in various
shells
OBJECTIVE QUESTIONS
Q.1 Assertion: M shell can accommodate maximum 2 electrons.
Reason: The maximum number of electrons that can be accommodated in
2
a shell is 2n .
Q.2 Assertion: Sodium atom has 11 electrons.
Reason: It has 1 electron in its outer most shell.
Q.3 Assertion: The electronic configuration of an element X with atomic
number 20 is K=2, L=8, M=10.
Reason: M shell can accommodate maximum 18 electrons.
Q.4 Assertion: The electronic configuration of 19K is 2, 8, 8, 1.
Reason: Atomic number of K is 19.
Q.5 Assertion: N shell can accommodate maximum 32 electrons
Reason: Serial number of N shell is 4.
Q.6 The number of electrons in the valence shell of calcium is
a) 6 b) 8
c) 2 d) 4
Q.7 The electronic configuration of 15P is
31
a) 2,8,5
b) 2,5,8
c) 8,2,5
d) None of the above
Which of the following do not represent Bohr’s model of an atom correctly?

I II III IV

a) I and II b) II and III
c) I and III d) I and IV

SUBJECTIVE
S.LNo. Questions Mark
Q.1 How many valence electrons does an atom of Magnesium contain? 1

1
3
2
Q.2 How are the three species 1 H , 1H , 1H differ from each other? 1
Q.3 The atomic number and mass number of an element are 13 and 27 3

1