Science Express

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• PROBLEM OF THE DAY. 🤔

a. What is a mass spectrum?

b. Chlorine has two isotopes. The isotopic mass and percentage abundance of the heavier isotope are 36.98 and 24.95% respectively.
i) Calculate the isotopic mass of the lighter isotope;
ii) Sketch the mass spectrum of chlorine element.
[Ar(Cl ) = 35.5 ]

Which of the following units is not a S. I units?
A. metre
B. kilogram
C. yard
D. seconds.

The two(2) types of bonds in ammonium chloride, NH4Cl are
A. Covalent and Ionic
B. Metallic and Ionic
C. Polar covalent and Ionic
D. Coordinate and covalent.