2006-10-02 07:10:34 · 7 answers · asked by lost 1 in Science & Mathematics ➔ Chemistry
Two extra neutrons in the nucleus of the heavier isotope. That is it.
2006-10-02 07:13:20 · answer #1 · answered by Vincent G 7 · 1⤊ 0⤋
Hi. I believe it's the number of neutrons. Br-81 would have 2 more.
2006-10-02 07:12:14 · answer #2 · answered by Cirric 7 · 1⤊ 0⤋
Bromine Atomic Structure
2016-10-14 02:43:15 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Two extra neutrons in the nucleus. Each neutron adds one amu to the atomic weight of the element.
2006-10-02 12:25:49 · answer #4 · answered by Fed Bernal 1 · 0⤊ 0⤋
Different numbers of neutrons.
Atoms of the same element with different number of neutrons are called isotopes
2006-10-02 08:11:27 · answer #5 · answered by Dr. J. 6 · 0⤊ 0⤋
17 trans-metric giga-watts X 3 to the second power of 9.
2006-10-02 07:23:31 · answer #6 · answered by Anonymous · 0⤊ 0⤋
79 electrons and 81 electrons. they are ions...
2006-10-02 07:12:01 · answer #7 · answered by Anonymous · 0⤊ 1⤋