a) spot where electron is in an atom
b) a wave for an allowed energy state for an electron in atom
c) A wave for an allowed energy state for an electron in an atom or molecule
d) Sub-shell of an atom.
7. What are allotropes?
a) members of the same atom but different neutrons
b) Different forms of the same element
c) Different forms of the same atom
d) Different structures of the same element
8. what is octet rule?.
a) When electrons are 8 in an orbital
b) During bond formation, when atoms attain 8 electrons in valence shell elec-
tronic configuration.
c) when elements of group 8 (noble gases) are stable
d) having 8 valence electrons