Chapter 9
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This document discusses key concepts about atoms including: - The three main parts of an atom are protons, neutrons, and electrons. Protons are in the nucleus with a positive charge, neutrons are in the nucleus with no charge, and electrons orbit the nucleus with a negative charge. - Atoms are identified by their atomic number which is the number of protons, and isotopes are atoms of the same element with different numbers of neutrons. The mass number is the total number of protons and neutrons. - Radioactivity and nuclear decay were discovered through studies of uranium and radium emitting radiation. Radioactive elements spontaneously emit radiation through processes like alpha, beta, and gamma decay that change the nucleus.
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The document defines several key chemistry concepts:
- An atom is the smallest part of an element, and a compound is made up of two or more elements joined together. Avogadro's constant is the number of particles in one mole.
- Atomic number refers to the number of protons in an atom's nucleus. Mass number is the sum of protons and neutrons. Isotopes are atoms with the same number of protons but different neutrons.
- Standard enthalpy changes refer to energy changes that occur during specific chemical reactions or changes of state under standard temperature and pressure conditions.
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This document discusses the structure of atoms and the periodic table. It explains that atoms are made up of protons, neutrons, and electrons. Elements are organized on the periodic table based on their atomic number. Each element has an atomic symbol. The document also describes isotopes, which are variants of an element with different numbers of neutrons. It defines key terms like atomic mass, mass number, and ions.
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This document discusses isotopes and atomic structure. It defines isotopes as atoms of the same element that have the same number of protons but different numbers of neutrons. Isotopes have the same chemical properties but slightly different physical properties. The document also discusses nucleon number, which is the total number of protons and neutrons in an atom's nucleus. The mass number equals the nucleon number. Radioactive isotopes are unstable and undergo nuclear decay over time into stable daughter isotopes.
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"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
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In Odoo, making a field required can be done through both Python code and XML views. When you set the required attribute to True in Python code, it makes the field required across all views where it's used. Conversely, when you set the required attribute in XML views, it makes the field required only in the context of that particular view.
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South African Journal of Science: Writing with integrity workshop (2024)
Chapter 9
- 2. Parts of an Atom Proton Neutron Electron Nucleus
- 3. Atoms Electron or e- / Charge 1- / Cloud around nucleus Proton or p / Charge 1+ / Nucleus Neutron or n / Charge 0 / Nucleus
- 4. Atoms Atomic number: the number of protons in an atom of an element Different elements have different atomic numbers Carbon is 6 / Oxygen is 8 / Nitrogen is 7
- 6. Isotope Atoms of the same element that have different numbers of neutrons Example: Carbon
- 7. Mass Number The sum of the number of protons and neutrons in an atom Mass number = number of protons + number of neutrons
- 8. Isotope Carbon-12 6 protons 6 neutrons Mass number = 12
- 9. Average Atomic Mass The average mass of the element’s isotopes, weighted according to the abundance of each isotope This number shows on the periodic table
- 11. Radioactivity Henri Becquerel studied uranium Marie Curie discovered two new radioactive elements
- 12. Radioactive Elements that spontaneously emit radiation Uranium, radium
- 13. Nuclear Decay A process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation Alpha decay, beta decay, gamma decay
- 14. Ions An atom that is no longer neutral because it has gained or lost electrons Positive ions gained a proton Negative ions gained an electron