The mass spectum of Element shows four Peaks How many isotke has the Element 3
a. 7 B z
C 3
d 4
D An element Q bas moss number y and atomic Alumbei Z. How man
tomof? neutron are these in an atom Q?
BZ
of D-Y
cy-z
(2) Neon has two isotopes zee and 20e. If the relature atomic mass
of neon is 20-18, What is the percentage abundance of the lighten
isotopes?
9.91 b. 0.91 C. 9 d. 0-09
An atom is electrically neutral if the number of
a. electron is equal to the number of neutrons
is equal to the atomic number (
number of neutrons
of elections​