Atomic Number, Mass Number, Isotopes Jamb Chemistry Past Questions
Question 1
The relative atomic mass of a naturally occurring lithium consisting of 90%\(\frac{7}{3}\)Li and 10%\(\frac{6}{3}\)Li is
- A. 6.2
- B. 6.8
- C. 7.1
- D. 6.9
Question 2
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
- A. 16
- B. 15
- C. 31
- D. 46
Question 3
Which quantum divides shells into orbitals?
- A. Spin
- B. Principal
- C. Azimuthal
- D. Magnetic
Question 4
How many valence electrons are contained in the element \(^{31}_{15}P\)?
- A. 3
- B. 4
- C. 15
- D. 31
Question 5
To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
- A. Passed over heated copper(ii)oxide
- B. Bubbled through water
- C. Bubbled through conc H\(_2\)SO\(_4\)
- D. Bubbled through conc NAOH
