alpha particles, two protons plus two neutrons (

There were composites of elementary particles—deuterons, a proton plus a neutron (the deuteron is a special part of the story told in this book because it is the nucleus of the heavy hydrogen atom, deuterium), and alpha particles, two protons plus two neutrons (the nucleus of the helium atom is an alpha particle).

helium nucleuses and neutrons

For instance, beta particles are electrons, alpha particles are helium nucleuses and neutrons are uncharged particles.

helium atom

An alpha particle is also known as helium atom and one proton has two neutrons.

the nuclei of helium atoms emitted from the nucleus of the radioactive progenitor

Alpha particles are the nuclei of helium atoms emitted from the nucleus of the radioactive progenitor.

a form of radiation

Alpha particles or alpha rays are a form of radiation with high ionizing, corpuscular energy and with a low penetration capacity due to the high cross section.

radiation

The type of radiation radium 223 uses is called alpha particles.

helium atoms which have shed two of their electrons

Alpha particles are helium atoms which have shed two of their electrons.

a helium atom without a helium atom's electrons

In 1907 British physicist Ernest Rutherford's research showed that the alpha particle is a helium atom without a helium atom's electrons.

a plus-2 charged helium atom in high-speed motion

An alpha particle is a plus-2 charged helium atom in high-speed motion.

a stripped helium atom

According to wiki, an alpha particle is a stripped helium atom, so by definition has no electrons...

the nuclei of helium atoms: slow moving

Alpha particles are the nuclei of helium atoms: slow moving, they cannot penetrate the skin, but can cause severe damage if swallowed.

ionized helium atoms that are positively charged

Alpha particles are ionized helium atoms that are positively charged.

a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft

alpha particles is a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft.

very low energy radiation

Alpha particles are very low energy radiation consisting of protons, nucleus's with no, or a few electrons.

a helium atom with two positive charges

the Periodic Table will be remembered that an alpha particle is a helium atom with two positive charges.

helium atoms that don’t have electrons

Alpha particles are helium atoms that don’t have electrons.

a helium nucleus i.e. a helium atom that has lost i.e. a helium atom's two orbital electrons

The alpha particle is a helium nucleus i.e. a helium atom that has lost i.e. a helium atom's two orbital electrons.

the nucleus of aHelium atom

Thealpha particles are the nucleus of aHelium atom and have a charge ofmagnitude 2.

the nuclei of helium atoms, which later investigation confirmed

In 1907 the British physicist Ernest Rutherford showed that alpha particles are the nuclei of helium atoms, which later investigation confirmed.

nuclear reactions

Alpha particles are used in bringing about various nuclear reactions, particularly in obtaining neutrons (9B + α → 12C+n) and certain radioactive isotopes.