yes if someone would help me with this I would appreciate it!
2006-09-25 13:46:42 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
Helium has the atomic number 2
There doesn't seem to be one with an atomic mass of two, though.
2006-09-25 13:49:00 · answer #1 · answered by ideogenetic 7 · 0⤊ 0⤋
Deuterium is the Hydrogen isotope with an atomic mass number of 2. It is a Hydrogen atom with an extra neutron in its nucleus.
Helium is the atomic element with an atomic number of 2: it has two protons in its nucleus.
2006-09-25 21:07:12 · answer #2 · answered by midwestbruin 3 · 0⤊ 0⤋
deuterium is an isotope of hydrogen with 1 proton and 1 neutron, for an atomic mass of 2.
2006-09-25 21:23:47 · answer #3 · answered by jogimo2 3 · 0⤊ 0⤋
Helium, has an atomic number of 2 because of the two protons in its nucleus.
2006-09-25 20:55:20 · answer #4 · answered by Brandon K 2 · 0⤊ 0⤋
there is no element with a mass number of 2..hydrogen is close..it has a mass number of like 1.007
2006-09-25 20:50:37 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Helium
2006-09-25 20:47:49 · answer #6 · answered by trinitybelwoodspark 3 · 1⤊ 1⤋
Hi. Deuterium, I think. Hydrogen with a neutron attached.
2006-09-25 20:49:34 · answer #7 · answered by Cirric 7 · 4⤊ 0⤋
check out a periodic chart and see which is no. 2. i think its hydrogen
2006-09-25 23:48:38 · answer #8 · answered by hondacobra 2 · 1⤊ 0⤋
He - Helium
2006-09-25 20:47:54 · answer #9 · answered by BrianW 3 · 0⤊ 1⤋
hydrogen???
2006-09-25 20:48:59 · answer #10 · answered by Anonymous · 0⤊ 1⤋