1) Isotopes are atoms of the same element. They have the same number of ____________? a) protons b) electrons c) neutrons 2) What is the maximum number of electrons the innermost electron shell (the first electron shell) can hold? a) 1 b) 2 c) 4 d) 8 3) What is the maximum number of electrons the second and third electron shells can hold? a) 2 b) 4 c) 8 d) 10 4) Atom A has 3 protons and 4 neutrons. Atom B has 3 protons and 3 neutrons. Are A and B isotopes? a) Yes b) No 5) Which element has atoms with the electronic configuration 2, 6. a) lithium b) carbon c) oxygen d) fluorine 6) Which element has atoms with the electronic configuration 2, 8, 5? a) nitrogen b) phosphorus c) chlorine d) sulfur 7) Fill in the blank: elements in the same period have the same number of ______________________. a) electron shells b) electrons c) valence electrons d) protons 8) Fill in the blank: elements in the same group have the same number of ______________________. a) electron shells b) electrons c) valence electrons d) neutrons 9) What is meant by a stable electronic configuration (atom does not react)? a) Fully filled electron shells b) Empty electron shells c) Fully filled valence electron shell d) Partly filled valence electron shell

Electronic configuration and isotopes quiz

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