Atoms and Electrons » Exercise – 1
1. In general, a shell contains a maximum of …………. electrons.
(a) 2n
(b) 2n2
(c) 2n–1
(d) 2n+1
2. Emission of a beta particle from an atom :
(a) increases the number of protons in an atom
(b) increases the number of neutrons in an atom
(c) decreases the number of protons in an atom
(d) decreases the number of neutrons in an atom
3. If an atom has an atomic number of 6, then it has :
(a) 3 electrons & 3 protons
(b) 4 electrons & 2 protons
(c) 2 electrons & 4 protons
(d) 6 electrons & 6 protons
4. An excited electron in an atom returns to the ground state :
(a) always in one jump
(b) in one or more jumps
(c) always in two jumps
(d) always in three jumps
5. The maximum number of electron that an M-shell of an atom can contain is :
(a) 4
(b) 12
(c) 18
(d) 34
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