Soddy was born at 5 Bolton Road,
England. He went to school at
Eastbourne College, before going on to study at
University College of Wales at Aberystwyth and at
Merton College, Oxford, where he graduated in 1898 with first class honors in chemistry.
 He was a researcher at
Oxford from 1898 to 1900.
In 1900 he became a demonstrator in
McGill University in
Quebec, where he worked with
Ernest Rutherford on
 He and Rutherford realized that the anomalous behaviour of radioactive elements was because they
decayed into other elements. This decay also produced
gamma radiation. When radioactivity was first discovered, no one was sure what the cause was. It needed careful work by Soddy and Rutherford to prove that atomic
transmutation was in fact occurring.
In 1903, with Sir
William Ramsay at
University College London, Soddy showed that the decay of
 In the experiment a sample of radium was enclosed in a thin-walled glass envelope sited within an evacuated glass bulb. After leaving the experiment running for a long period of time, a spectral analysis of the contents of the former evacuated space revealed the presence of helium.
 Later in 1907, Rutherford and
Thomas Royds showed that the helium was first formed as positively charged nuclei of helium (He2+) which were identical to
alpha particles, which could pass through the thin glass wall but were contained within the surrounding glass envelope.
From 1904 to 1914, Soddy was a lecturer at the
University of Glasgow. In May 1910 Soddy was elected a
Fellow of the Royal Society.
 In 1914 he was appointed to a chair at the
University of Aberdeen, where he worked on research related to
World War I.
The work that Soddy and his research assistant
Ada Hitchins did at Glasgow and Aberdeen showed that
uranium decays to
 It also showed that a radioactive element may have more than one
atomic mass though the chemical properties are identical.
 Soddy named this concept
isotope meaning 'same place'. The word 'isotope' was initially suggested to him by
Margaret Todd. Later,
J. J. Thomson showed that non-radioactive elements can also have multiple isotopes.
In 1913, Soddy also showed that an atom moves lower in
atomic number by two places on alpha emission, higher by one place on beta emission. This was discovered at about the same time by
Kazimierz Fajans, and is known as the
The Interpretation of Radium (1909) and Atomic Transmutation (1953).
In 1918 he announced discovery of a stable isotope of
Protactinium, working with
John Arnold Cranston. This slightly post-dated its discovery by German counterparts; however, it is said their discovery was actually made in 1915 but its announcement was delayed due to Cranston's notes being locked away whilst on active service in the
First World War.
In 1919 he moved to the University of Oxford as Dr Lee's Professor of Chemistry, where, in the period up till 1936, he reorganized the laboratories and the syllabus in chemistry. He received the 1921
Nobel Prize in chemistry for his research in radioactive decay and particularly for his formulation of the theory of isotopes.
His work and essays popularising the new understanding of radioactivity was the main inspiration for
H. G. Wells's
The World Set Free (1914), which features atomic bombs dropped from biplanes in a war set many years in the future. Wells's novel is also known as The Last War and imagines a peaceful world emerging from the chaos. In
Wealth, Virtual Wealth and Debt Soddy praises Wells’s The World Set Free. He also says that radioactive processes probably power the stars.
In four books written from 1921 to 1934, Soddy carried on a "campaign for a radical restructuring of global monetary relationships",
 offering a perspective on economics rooted in physics – the
laws of thermodynamics, in particular – and was "roundly dismissed as a crank".
 While most of his proposals – "to abandon the
gold standard, let international
exchange rates float, use federal
surpluses and deficits as
macroeconomic policy tools that could counter
cyclical trends, and establish bureaus of
economic statistics (including a
consumer price index) in order to facilitate this effort" – are now conventional practice, his critique of
fractional-reserve banking still "remains outside the bounds of conventional wisdom" although a recent paper by the
IMF reinvigorated his proposals.
 Soddy wrote that financial debts grew exponentially at compound interest but the real economy was based on exhaustible stocks of
fossil fuels. Energy obtained from the fossil fuels could not be used again. This criticism of
economic growth is echoed by his intellectual heirs in the now emergent field of
Wealth, Virtual Wealth and Debt Soddy cited the (fraudulent)
Protocols of the Learned Elders of Zion as evidence for the belief, which was relatively widespread at the time, of a "financial conspiracy to enslave the world". He used the imagery of a Jewish conspiracy to buttress his claim that "A corrupt monetary system strikes at the very life of the nation." In the same document, he made reference to "the semi-Oriental" who is "supreme" in "high finance" and to an "iridescent bubble of beliefs blown around the world by the Hebraic hierarchy". Later in life he published a pamphlet Abolish Private Money, or Drown in Debt (1939) with a noted publisher of anti-Semitic texts.
 The influence of his writing can be gauged, for example, in this quote from
"Professor Frederick Soddy states that the Gold Standard monetary system has wrecked a scientific age! ... The world's bankers ... have not been content to take their share of modern wealth production – great as it has been – but they have refused to allow the masses of mankind to receive theirs."
He rediscovered the
Descartes' theorem in 1936 and published it as a poem, "The Kiss Precise", quoted at
Problem of Apollonius. The
kissing circles in this problem are sometimes known as Soddy circles.