Unit - 4.2 Geometric Representation of Atomic Structure — CHEMISTRY STD 8 — Question
ICSE BoardEnglish MediumSTD 8CHEMISTRYUnit - 4.2 Geometric Representation of Atomic Structure2 Marks
Question
Define (a) atomic number (b) mass number.
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Answer
(a) Atomic number: Atomic number refers to the number of protons present in an atom. It is denoted by Z. Example: An atom of oxygen contains 8 proton Therefore its atomic number is 8.
(b) Mass number: Mass number refers to the sum of the number of protons and neutrons present in
the nucleus of an atom and denoted by A Mass number = Number of protons + Number of neutrons.
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