Concept explainers
(a)
Interpretation:
Symbol for neutral noble-gas element that has 21 neutrons has to be written.
Concept Introduction:
Each and every element present in the Periodic table has a unique name. Some of the elements are named considering their
Chemical names are represented as atomic symbols. In the symbols, the mass number and atomic number are shown. The complete
Atomic number is the total number of protons present in the atom of an element. Mass number is the total number of protons and neutrons present in nucleus of an atom.
(b)
Interpretation:
Symbol for alkaline earth metal with 40 as mass number and
Concept Introduction:
Refer part (a).
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Chemistry: Principles and Practice
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