Nonpolar covalent • Moles = Mole * (Number of electrons in element/ 1 mole) • Atoms = Moles * 6.02*10^23‚ Mass number (Z) is the sum of protons plus neutrons • Isotopes of an element have the same number of protons‚ but different numbers of neutrons. • Isotopes of an element have the same number of protons‚ but different numbers of neutrons. • As bond order increases‚ bond length decreases. As bond order increases‚ bond strength increases • Allotropes: different forms of the same element
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THE NEGATIVE PHYSICAL EFFECTS OF NUCLEAR RADIATION Page 1 Abstract Nuclear radiation has been a major problem since 1941 when the Second World War began. A major contribution to World War Two is the nuclear bomb‚ also known as the Atom bomb. Once the two bombs were dropped‚ the usually terminal Leukemia was derived throughout Japan. There are three types of radiation‚ Alpha‚ Beta‚ and Gamma radiation. In my study of radiation I discovered that radiation can damage many cells in your body
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matter that still retains the properties of an element NEUTRONS- no electrical charge ELECTRONS- negative charge PROTONS- positive charge ATOMIC NUCLEUS- formed by neutrons and protons ATOMIC NUMBER- number of protons in its nucleus MASS NUMBER- the sum of protons and neutrons in the nucleus ATOMIC MASS- the atom’s total mass‚ can be approximated by the mass number ISOTOPES- two atoms of an element that differ in the number of neutrons RADIOACTIVE ISOTOPES- decay
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GOVERNMENT OF TAMILNADU STANDARD NINE TERM I VOLUME 3 SCIENCE SOCIAL SCIENCE NOT FOR SALE Untouchability is Inhuman and a Crime A Publication Under Free Textbook Programme of Government of Tamilnadu Department of School Education © Government of Tamilnadu First Edition - 2013 (Published under Uniform System of School Education Scheme in Trimester Pattern) Textbook Prepared and Compiled by State Council of Educational Research and Training College Road‚ Chennai - 600
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there are three subatomic particles: protons‚ neutrons‚ and electrons (as seen in the Helium atom below). Other particles exist as well‚ such as alpha and beta particles (which will be discussed later on). Most of an atom’s mass is in the nucleus‚ a small dense area at the center of every atom formed by nucleons. Nucleons are protons and neutrons. All of the positivity of an atom is contained in the nucleus‚ because the protons have a positive charge. Neutrons are neutral‚ meaning they have no charge
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What is inside an atom? * A positively charged nucleus composed of protons and neutrons * Electrons that surround the nucleus What are isotopes? Isotopes are atoms with the same number of protons and different numbers of electrons How do we represent different atoms? What is specific charge? The specific charge of a particle is defined as its charge divided by its mass What keeps protons and neutrons in a nucleus together? A stable isotope has nuclei that do not disintegrate‚ so there
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What You Need To Know for the Chemistry Regents Exam The Test The Chemisty Regents Exam is broken down into three sections: Part A: 35 mulitple choice questions from all units covered over the course of the school year. Part B: Approximately 25 questions‚ with a mix of short answer and multiple choice. Questions focus on the Reference Tables‚ graphing‚ and laboratory experiments. Part C: Approximately 15 short answer questions‚ most broken down into smaller parts. This is often an
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Nuclear power‚ it’s the probably the most modern nature generator of electricity that we have available at this movement‚ but is all this power really worth it? Nuclear power use uranium to generate electricity‚ a metal that is mined as in large quantities‚ with Canada‚ Australia and U.S providing more than half of the world’s supplies. Humanity is using coal and oil faster than earth can make it‚ if people use oil too much then it can be run out in the next 70 years. Furthermore‚ nuclear power work
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protons and neutrons. The weak force keeps atoms together to make bigger stuff. Nearly everything in the physical universe is made up of just three fermions‚ two types of quark and an electron. Each type of quark carries a specific charge. Up quarks carry a positive two thirds charge (+2/3). Down quarks carry a negative one third charge (-1/3). Electrons carries a ‘whole’ negative charge (-1). Depending on how these three quarks are arranged‚ you can arrive at a particle with no charge (neutron) or a
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Index Sl. No. Topic Page No. 1. Introduction 3 2. The LHC 4 3. Design 5 4. Cyclotron 7 5. Mathematics 8 6. Practical Applications 9 7. Conclusion 13 8. Acknowledgement 14 9. Bibliography 14 “The beauty of living things is the atoms that go into it‚ but the way those atoms are put together.” -Carl Sagan Introduction If‚ in some cataclysm‚ all of scientific knowledge was to be destroyed‚ and
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