Chemistry
An atom of an element has 9 protons, 9 electrons and 10 neutrons. State its
(a) atomic number
(b) mass number and
(c) electronic configuration.
Atomic Structure
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Answer
(a) Atomic number = Number of electrons
Hence, atomic number is 9
(b) Mass number = Number of protons + Number of Neutrons
Mass number = 9 + 10 = 19
Hence, mass number is 19
(c) Electronic configuration - 2, 7
K shell - 2 electrons
L shell - 7 electrons
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