Chemistry - Atomic structure- electrons and stability exercises

a) -1
b) +1
c) -3
d) +3

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Mass number = neutrons + protons = 25
Atomic number = protons = 13
Electronic configuration = 2,8,3
It has three outer shell electrons therefore it will give three electrons away.
Electronic configuration after exchange of electrons = 2,8
Charge = 3+ (cation)

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Mass number = neutrons + protons = 22
Atomic number = protons = 8
Electronic configuration = 2,6
It has six outer shell electrons therefore it will take two electrons.
Electronic configuration after exchange of electrons = 2,8
Charge = 2- (anion)

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Mass number = neutrons + protons = 27
Atomic number = protons = 12
Electronic configuration = 2,8,2
It has two outer shell electrons therefore it will give two electrons away.
Electronic configuration after exchange of electrons = 2,8
Charge = 2+ (cation)

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The atom Getting stable Exercises
1)An atom "X" has 12 electrons, 12 protons and 15 neutrons a) What is its atomic mass? b) What is its atomic number? c) What is its electronic configuration? e) Will it take or give electrons? d) What is its electronic configuration after electrons have been given or taken? e) What is the charge on the atom after electrons have been exchanged?	Solution
2)An atom "Y" has 8 electrons, 8 protons and 14 neutrons a) What is its atomic mass? b) What is its atomic number? c) What is its electronic configuration? e) Will it take or give electrons? d) What is its electronic configuration after electrons have been given or taken? e) What is the charge on the atom after electrons have been exchanged?	Solution
3)An atom "Y" has 13 electrons, 13 protons and 12 neutrons a) What is its atomic mass? b) What is its atomic number? c) What is its electronic configuration? e) Will it take or give electrons? d) What is its electronic configuration after electrons have been given or taken? e) What is the charge on the atom after electrons have been exchanged?	Solution
4) What is the charge on the atoms with a) 9 protons, 9 neutrons and 10 electrons b) 11 protons, 10 neutrons and 10 electrons c) 7 protons, 6 neutrons and 10 electrons d) 5 protons, 2 neutrons and 2 electrons	Solution
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