2006-06-09 08:06:44 · 8 answers · asked by Anonymous in Education & Reference ➔ Homework Help
20.
40 - 20 = 20.
The mass number is the number of protons and neutrons combined. The atomic number is the number of protons.
2006-06-09 08:09:16 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The number of protons determines the element. The number of neutrons can vary. Calcium has 20 protons. The number of neutrons can be from 14 to 37 neutrons. Stable isotopes have 20, 22, 23 and 24 neutrons. The isotope with 20 neutrons comprises 96.941% of the naturally occurring Calcium
2016-03-26 23:20:53 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Mass Number = Number of proton + Number of Neutron
Also, Atomic Number = how many protons the element contains
For Calcium, 40=20+number of neutron
Therefore, it has 20 neutrons.
2006-06-09 09:00:20 · answer #3 · answered by Giovanna 1 · 0⤊ 0⤋
20
2006-06-09 08:11:07 · answer #4 · answered by Anonymous · 0⤊ 0⤋
40-20=20Neutrons.
Mass number minus atomic number=neutrons
2006-06-09 08:09:56 · answer #5 · answered by JESSICA 2 · 0⤊ 0⤋
40-20=20
2006-06-09 08:11:49 · answer #6 · answered by Gabriela 1 · 0⤊ 0⤋
Get back to your Chemistry teacher who introduced you to Atomic strucrure. The answer he is going to give you is 20.
2006-06-09 08:23:58 · answer #7 · answered by smuded 1 · 0⤊ 0⤋
twenty mass-atomic #.
Also, the symbol is "Ca", not "CA" (notice the lowercase "a" - each upper case letter denotes the beginning of a new element)
2006-06-09 08:09:35 · answer #8 · answered by Richard H 7 · 0⤊ 0⤋