Each of the following were important contributors to what we know about atomic structure, the elements or radioactivity: Bohr Bequerel Curie Dalton The Greeks Moseley Thomson Rutherford Select from the list above one answer to each of the following. a) Who proposed the early theory that matter consists of the four elements: earth, air, fire and water? b) Who described atoms as small indivisible particles? c) Who identified electrons as sub-atomic particles? d) Who is credited with the discovery of the nucleus of the atom? e) Who proposed a model for the atom in which the electrons circulated around the nucleus in fixed energy levels or orbits? f) Who discovered that uranium salts emitted radiation? g) Who received a Nobel Prize for the isolation of the elements polonium and radium? h) Whose determination of the charge on the nucleus of atoms allowed the systematic arrangement of the elements in the modern periodic table?

Leaving Cert Chemistry Atomic Structure: Each of the following were impor

Each of the following were important contributors to what we know about atomic structure, the elements or radioactivity: Bohr Bequerel Curie Dalton The Greeks Moseley Thomson Rutherford Select from the list above one answer to each of the following - Leaving Cert Chemistry - Question 5 - 2005

Question 5

Each of the following were important contributors to what we know about atomic structure, the elements or radioactivity: Bohr Bequerel Curie Dalton The Greeks Mosel... show full transcript

Worked Solution & Example Answer:Each of the following were important contributors to what we know about atomic structure, the elements or radioactivity: Bohr Bequerel Curie Dalton The Greeks Moseley Thomson Rutherford Select from the list above one answer to each of the following - Leaving Cert Chemistry - Question 5 - 2005

Step 1

a) Who proposed the early theory that matter consists of the four elements: earth, air, fire and water?

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Answer

The early theory proposing that matter consists of four elements—earth, air, fire, and water—was introduced by the Greeks. This ancient philosophical view laid the groundwork for later scientific investigations into the nature of matter.

Step 2

b) Who described atoms as small indivisible particles?

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Answer

John Dalton is credited with the notion that atoms are small, indivisible particles. His atomic theory established the fundamental concept of the atom as the basic unit of matter, leading to significant advancements in chemistry.

Step 3

c) Who identified electrons as sub-atomic particles?

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J.J. Thomson is the scientist who identified electrons as sub-atomic particles. He discovered the electron through his experiments with cathode rays, which demonstrated the existence of these negatively charged particles.

Step 4

d) Who is credited with the discovery of the nucleus of the atom?

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Ernest Rutherford is credited with the discovery of the nucleus of the atom. His gold foil experiment revealed that atoms consist of a small, dense nucleus surrounded by a cloud of electrons.

Step 5

e) Who proposed a model for the atom in which the electrons circulated around the nucleus in fixed energy levels or orbits?

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Niels Bohr proposed a model of the atom wherein electrons exist in fixed energy levels or orbits around the nucleus. This model refined earlier concepts and introduced the idea of quantized electron states.

Step 6

f) Who discovered that uranium salts emitted radiation?

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Henri Becquerel discovered that uranium salts emitted radiation. His pioneering work in studying radioactivity laid the foundation for future research in nuclear physics.

Step 7

g) Who received a Nobel Prize for the isolation of the elements polonium and radium?

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Marie Curie received a Nobel Prize for her work in the isolation of the radioactive elements polonium and radium. Her groundbreaking research significantly advanced the field of radioactivity.

Step 8

h) Whose determination of the charge on the nucleus of atoms allowed the systematic arrangement of the elements in the modern periodic table?

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Answer

Henry Moseley's determination of the charge on atomic nuclei enabled the systematic arrangement of elements in the modern periodic table. His work provided a more accurate understanding of elemental properties based on atomic number.

Each of the following were important contributors to what we know about atomic structure, the elements or radioactivity: Bohr Bequerel Curie Dalton The Greeks Moseley Thomson Rutherford Select from the list above one answer to each of the following - Leaving Cert Chemistry - Question 5 - 2005

a) Who proposed the early theory that matter consists of the four elements: earth, air, fire and water?

b) Who described atoms as small indivisible particles?

c) Who identified electrons as sub-atomic particles?

d) Who is credited with the discovery of the nucleus of the atom?

e) Who proposed a model for the atom in which the electrons circulated around the nucleus in fixed energy levels or orbits?

f) Who discovered that uranium salts emitted radiation?

g) Who received a Nobel Prize for the isolation of the elements polonium and radium?

h) Whose determination of the charge on the nucleus of atoms allowed the systematic arrangement of the elements in the modern periodic table?

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