The "11" refers, precisely, to the number of nucleons.
the nucleons contain neutrons and protons in it
There are A + Z nucleons in an element
Beryllium-9 has 9 nucleons.
238 nucleons in 238U.
Protons and neutrons because they are in the nucleus, electrons are around the nucleus.
The main constituents of the nucleus are protons and neutrons, but each of these is made up of smaller particles known as quarks.
Protons and neutrons are collectively called nucleons, which are particles found in the nucleus of an atom. Nucleons are responsible for the majority of an atom's mass and exist alongside electrons in an atom.
An ALPHA particle may be thought of a a helium nucleus. It contains two protons and two neutrons. An alpha particle is a high speed helium nucleus (He^(2+)).
The average amount of neutrons in phosphorus is 16 but may vary with different isotopes
There are 14, six protons and 8 neutrons.
total number of protons and neutrons in the nucleus.
He4 would contain four atoms, if it were possible for helium to combine that way.4He (which is pronounced "helium four") is a single atom, with the 4 being the number of nucleons (and thus the approximate atomic weight).