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WorksheetsSTRUCTURE OF ATOMS CLASS 11
Total questions: 20
Worksheet time: 19mins
Q.1-Which one will have the highest 2nd ionisation energy?
(a) 1s2 2s2 2p6 3s1
(b) 1s2 2s2 2p4
(c) 1s2 2s2 2p6
(d) 1s2 2s2 2p6 3s2
Q.3-In the modern periodic table, the number of period of the element is the same as
(a) atomic number
(b) principal quantum number
(c) azimuthal quantum number
(d) atomic mass
Q.6-The number of orbitals in the fourth energy level is
32
4
16
9
Q.7-For principal quantum number n = 4, the total number of orbitals having l = 3 is
(a)3
(b)5
(c)7
(d)9
Q.8-Uncertainty in position of a particle of 25 g in space is 10–5m. Hence, uncertainty in velocity (ms–1) is (Plancks constant h = 6.6 x 10–34 Js)
5.0 × 10–24
0.5 × 10–34
2.1 × 10–34
2.1 × 10–28
Q.9-An element has 2 electrons in K shell, 8 electrons in L shell, 13 electrons in M shell and one electron in N shell. The element is
Cu
Fe
Cr
Ti
Q.12-14 elements after actinium is called
a. Lanthanides
b. Actinides
c. d-block elements
d. P- block elements
Q.13- Electronic configuration of Al+3 is
a. 2,8,3
b. 2,8,8
c. 2,8
d. 2,8,8,3
Q.14- Which is not true about the noble gases?
a. They are non metallic in nature
b. They exist in atomic form
c. All are radioactive in nature
d. Xenon is the most reactive among these
Q.15-Identify the wrong sequence of the elements in a group
a. Ca, Br, Ba
b. Cu, Au, Ag
c. N,P, As
d. Cl, Br, I
Q.16- An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is.
2
4
3
1
Q.19-Which of the reactions will need the maximum amount of energy?
(a) Na → Na+ + e–
(b) Ca+ → Ca2+ + e–
(c) K+ → K2+ + e–
(d) Al2+ → Al3+ + e–
Total number of orbitals associated in shell will be calculated by formula_______.
2n2
n2
n
none of the above
Orbital angular momentum depends on
l
n and l
n and m
m and s
The pair of ions having same electronic configuration is _______
(a) Cr+3,Fe+3
(b) Fe+3,Mn+2
(c) Fe+3, Co+3
(d) Sc +3,Cr+3
Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals:
(a) (i) n = 3, l = 2, ml = -2, ms = -1/2
(ii) n = 3, l= 2, ml = -1, ms = -1/2
(b) (i) n = 3, l = 1, ml = 1, ms = +1/2
(ii) n = 3, l = 2, ml = 1, ms = +1/2
(c) (i) n = 4, l = 1, ml = 1, ms = +1/2
(ii) n = 3, l = 2, ml = 1, ms = +1/2
(d) (i) n = 3, l = 2, ml = +2, ms = -1/2
(ii)n = 3, l = 2, ml = +2, ms = +1/2
(a) , (c)
(a), (d)
(c), (d)
(a), (d)
Which structure is wrong-
(i)
(ii)
(iii)
(iv)
Which of the following sets of quantum numbers are correct?
n l ml
(i) 1 1 +2
(ii) 2 1 +1
(iii) 3 2 –2
(iv) 3 4 –2
(i) ,(ii)
(i) ,(iii)
(i) ,(iv)
(ii) ,(iv)
Which of the following statements concerning the quantum numbers are
correct?
(i) Angular quantum number determines the three dimensional shape of
the orbital.
(ii) The principal quantum number determines the orientation and energy
of the orbital.
(iii) Magnetic quantum number determines the size of the orbital.
(iv) Spin quantum number of an electron determines the orientation of the
spin of electron relative to the chosen axis.
(i) ,(iv)
(i) ,(ii)
(iii) ,(iv)
(iii) ,(i)
In which of the following pairs, the ions are iso-electronic?
(i) Na+, Mg2+
(ii) Al3+, O–
(iii) Na+, O2–
(iv) N3–, Cl–
(i) ,(ii)
(i) ,(iii)
(ii) ,(iv)
(ii) ,(iv)
