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Under the heading #ylement", the original name is
first given, followed, in parentheses, by the zore accurate
name; the number following indicates the atomic weight of the
element in the physical scale of element weights. Thus radium
A is not radium at all but is the fora of the element polonium
having an atomic weight of 218, and commonly known as polonium
218, The designation alpha, beta and gama indicates the type
of the particle or ray enission of the respective element.
As the table indicates, radium itself enits only
the alpha particle in usable quantity, while the other radia-
tions are emitted by the decay elements, which are separate
elements differing in chemical and physical properties from
radium. Due to the disintegration caused by the ray amission,
ons-half of any given quantity of a radioactive element changes
into the next succseding elsaent over a given, though varying,
period of time, known as the Thalf life", Thus, in the above
table, one-half of a given quantity of radium changes into radon
over a poriod of 1590 years. The radon as it comes into exist-
ence immediately starts to disintegrate and one-half the radon
present at any one time becones redium A (polonium 218) in only
3.85 days. This division of the element continues into the next
succeeding element over varying periods of time, as shown in the
column captioned *Half Life", Thus, there is a constant setivi-
ty within the series, resulting in the appearance of new elements
in accordance with a definite and known time schedule.
The finel column in the table above indicates the
quantity at any one point of time of the several elements
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"ocrText": "sup\nUnder the heading #ylement\", the original name is\nfirst given, followed, in parentheses, by the zore accurate\nname; the number following indicates the atomic weight of the\nelement in the physical scale of element weights. Thus radium\nA is not radium at all but is the fora of the element polonium\nhaving an atomic weight of 218, and commonly known as polonium\n218, The designation alpha, beta and gama indicates the type\nof the particle or ray enission of the respective element.\nAs the table indicates, radium itself enits only\nthe alpha particle in usable quantity, while the other radia-\ntions are emitted by the decay elements, which are separate\nelements differing in chemical and physical properties from\nradium. Due to the disintegration caused by the ray amission,\nons-half of any given quantity of a radioactive element changes\ninto the next succseding elsaent over a given, though varying,\nperiod of time, known as the Thalf life\", Thus, in the above\ntable, one-half of a given quantity of radium changes into radon\nover a poriod of 1590 years. The radon as it comes into exist-\nence immediately starts to disintegrate and one-half the radon\npresent at any one time becones redium A (polonium 218) in only\n3.85 days. This division of the element continues into the next\nsucceeding element over varying periods of time, as shown in the\ncolumn captioned *Half Life\", Thus, there is a constant setivi-\nty within the series, resulting in the appearance of new elements\nin accordance with a definite and known time schedule.\nThe finel column in the table above indicates the\nquantity at any one point of time of the several elements"
}