A. the number of its protons.
B. the number of its protons plus the number of its neutrons
C. the number of its protons plus the number of its neutrons plus the number of its electrons
D. the number of its protons plus the number of its electrons
E. the number of its neutrons plus the number of its electrons
2007-05-09 17:03:55 · 5 answers · asked by stephanie c 1 in Science & Mathematics ➔ Chemistry
the atomic number(Z) of an atom is equal to the number of protons in the nucleus and the number of electrons in its shell
the mass number(A) of an atom is equal to the number of protons and neutrons
atomic number = p = e
mass number = n + p
no. of neutrons = A - Z
2007-05-09 19:12:53 · answer #1 · answered by ~!Blossom!~ 4 · 0⤊ 0⤋
answer A
Atomic number of an element is the number of protons
2007-05-09 18:17:05 · answer #2 · answered by maussy 7 · 0⤊ 1⤋
protons girl, protons. electrons barely weigh anything anyway, the ratio is lopsided. add neutrons, and you've got the atomic mass, in average.
look in the back of the book in the glossary, it would have been quicker. its a simple definition.
2007-05-09 18:27:36 · answer #3 · answered by Falcon Man 3 · 0⤊ 0⤋
A, the number of it's protons because that's what makes each element unique.
2007-05-09 18:04:52 · answer #4 · answered by clemsonfan1212 1 · 0⤊ 0⤋
A.
2007-05-09 17:57:10 · answer #5 · answered by sandwreckoner 4 · 0⤊ 1⤋