Structure of Atoms NDA Questions

Structure of Atoms MCQ Questions

7.
Which of the following elements has an atomic number of 11?
A.
Sodium (Na)
B.
Potassium (K)
C.
Magnesium (Mg)
D.
Calcium (Ca)
ANSWER :
A. Sodium (Na)
8.
The dual nature of matter is expressed by which principle?
A.
de Broglie hypothesis
B.
Heisenberg's uncertainty principle
C.
Planck's theory
D.
Einstein's theory
ANSWER :
A. de Broglie hypothesis
9.
The shape of the p-orbital is__________
A.
Dumbbell-shaped
B.
Spherical-shaped
C.
Planar
D.
Circular-shaped
ANSWER :
A. Dumbbell-shaped
10.
The energy of an electron in a hydrogen atom increases when it moves__________
A.
To a higher orbit
B.
To a lower orbit
C.
To the nucleus
D.
To the outermost shell
ANSWER :
A. To a higher orbit
11.
Which quantum number determines the orientation of the electron’s orbital?
A.
Azimuthal quantum number
B.
Principal quantum number
C.
Magnetic quantum number
D.
Spin quantum number
ANSWER :
C. Magnetic quantum number
12.
The number of orbitals in the p-sublevel is__________
A.
2
B.
3
C.
5
D.
4
ANSWER :
B. 3