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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Marie Curie was born in Poland but studied and carried out her research in Paris. In 1903, she shared the Nobel Prize in Physics with H. Becquerel and her husband Pierre for their discovery of radioactivity. (In 1911 she received the Nobel Prize in Chemistry for the discovery of two new chemical elements, radium and polonium, the latter named for her homeland, Poland.) They and others observed that a radioactive substance could emit three types of radiation: alpha (α), beta (β), and gamma (γ). If the radiation from a radioactive source is passed between electrically charged plates, some particles are attached to the positive plate, some to the negative plate, and others feel no attraction. Which particles are positively charged, which are negatively charged, and which have no charge? Of the two charged particles, which has the most mass?

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Radioactivity. Alpha (α), beta I(β), and gamma (γ) rays from a radioactive element are separated by passing them between electrically charged plates.

Interpretation Introduction

Interpretation:

For the Marie curie experiment, the negatively charged, positively charged, the no-charge particles and the charged particle having most mass from the radiation of a radioactive substance are needed to be determined.

Concept introduction:

  • Alpha rays are helium nuclei (He2+), so they are positively charged.
  • Beta rays are electrons, so they are negatively charged.
  • Gamma rays have neither mass nor charge, but they are in a highly energetic form of radiation.
  • The mass of helium nuclei (Alpha rays) is far greater than the mass of electrons (Beta rays).
Explanation

When the radiation of a radioactive substance is passed through electrically charged plates, some of the particles are attracted towards negative charged plate and some are attracted towards positively charged plate and some of the particles are neither attracted towards negative nor positive plates.

Alpha rays are helium nuclei (He2+) are attached to negative plate, because they are positively charged particle

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