What element results if 2 protons and 2 neutrons are ejected from a radium nucleus?
829932
Take radium and subtract two from its atomic number. Then find the element with that result as its atomic number. I'm too lazy to see what that is right now.
951654
proton (positive) in the nucleus\nneutron (no charge) in the nucleus\nelectron (negative) orbits nucleus at a great distance
509765
The three subatomic particles are the proton, the neutron and the electron. \n\nThe proton is positively charged, the neutron is neutral. The neutron is one tenth of a percent heavier then the proton. 17 protons and 18 neutrons form the nucleus of the chlorine atom, held together by the strong nuclear force.\n\nIn nature we also find chlorine atoms with 2 more neutrons. One out of four actually. Atoms with the same number of protons, but a different number of neutrons are called isotopes.\n\nElectrons run in orbits around the nucleus. They are negatively charged. Chlorine has 17 electrons, which together with the protons accounts for a neutral atom.\n\nHowever, the electrons tend to group in shells. The lowest shell has room for two electrons. The next two shells can harbour 8 each. But chlorine has 17 electrons. 17=2+8+7 and therefore the outer shell misses one to be completely full.\n\nChlorine therefore prefers to make compounds where it can catch an extra electron. Take for instance common salt a coumpound of sodium Na and chlorine Cl. The sodium atom gives up an electron and becomes Na+. The Cl atom becomes Cl-, filling the outer electron shell. The two ions combine and we have an NaCl molecule.\n\nNow you know, Jess!
642453
proton and neutron, the electrons are on the outer shell
776529
The number of protons in the fission product must be 92-55 = 37.  The number of neutrons must be 1+235-143-3 = 90.  Look up in the periodic table to see what element 37 is. It is virtually certain that 90 neutrons are too many for stability, and the product will be a beta emitter.
715843
B: Some mass is converted into energy in order to split the unstable nucleus into two, smaller, stable ones.\n\nC: Their nuclei are too big to remain in one lump of mass. Particles (alpha, beta, gamma, etc) start shooting off in all directions, to bring the nucleus down to a smaler size. It's all about the smaller size.\nAlso, no atom can have more than one nuclues, because then it would be two atoms. More or less elctrons make an atom into a charged ion, not an isotope. Neutrons are what make isotopes.
701573
a radioactive element is unstable because it has too many neutrons in its nucleus.
383020
they have the same number of protons and electrons but differing numbers of neutrons.  Since it is the electrons that determin the chemical properties of an element, two isotopes will react the same chemically, but may react differently nuclearly
246850
When the nucei of elements form, they are more or less stable combinations of protons and neutrons.  Unstable groupings decay usually in microseconds, or dont form at all.  For any given element, there is usually more than one stable number of neutrons for any given number of protons (the number of protons determine which element it is, the total number of protons and neutrons determine the molecular weight, and thus the isotope).  Often, one type of isotope is much much more stable or more energetically easy to form than others.  So, for example, usually oxygen has 8 protons and 8 neutrons-but sometimes it has 9 neutrons.  During the original formation process, which for larger elements usually occur during a violent nova or supernova explosion of a star, there are lots of free protons and neutrons, or naked nuclei of smaller atoms, being energetically smashed together.  So, just by chance, most will be the most stable or most easly formed nuclei, but a few will be slightly different.
194428
I assume you are using a half-life equation of the form:\nN(t) = N_0*e(-kt) where N(t) is the amount of radium remaining at time t and N_0 is the initial amount of radium. You should really provide this sort of information as the constant k is in no way universal (some people use r or lambda). Decay constant would be a more appropriate term.\n\nSo if the initial amount of radium is N_0 = 1 gram, then\nN(1622) = 0.5 grams(ie. there will only be a half a gram left after 1622 years). Take a natural log and solve for k.\n\nOnce you have k, for the second part let N_0 = 2.3 grams and solve for t where N(t) = 1.7 grams. You're going to need a natural log again for this guy, I trust you know how they work.\n\nAlso I'm pretty sure the previous answer is dead wrong.
649511
A carbon atom is one that has 6 proton in the nucleus. If it is uncharged, there will also be 6 electrons. The number of neutrons varies depending on the isotope. The most common isotope has 6 neutrons. There is another stable isotope with 7 neutrons and a radioactive one with 8.
288114
The atomic number tells you how many protons there are in the nucleus, and that's what identifies the element.  Subtract that number from the atomic weight and you get the number of neutrons.  Uranium has 92 protons and 143 neutrons (U235) or 146 neutrons (U238).  The different weights are called isotopes.  In an electrically neutral atom the number of electrons is the same as the number of protons.  Strip a few electrons away you get an ion (an ionized atom).  It's the structure of the electrons that strongly influences the chemical properties of the element.
128928
Protons, neutrons and electrons.  Of course the first two are composed of something else, but that probably isn't what they are going for here.
791909
It basically means the element is unstable, and it will decompose into other elements and smaller particles over time.  The element can give off two protons and two neutrons (alpha decay), or proton can convert into a neutron while giving off electron (beta decay), or it can give off electromagnetic energy that's more dangerous (gamma radiation).  It gets way more complicated. Yuck.
62030
Protons and neutrons.
1023546
Radium and polonium are primarily alpha emitters (an alpha particle is essentially the nucleus of a HELIUM atom, without electrons), as the previous poster noted. But they also emit gamma radiations, and many of the isotopes are beta emitters. There are even a few cases where they emit positrons (for example, Polonium 186).
793681
Those are the alkaline earth metals, technically referred to as Group 2.  They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra).  Radium has two valence electrons and is in Group 2, but is sometimes left off lists of the alkaline earth metals because it is radioactive.