Listed in the periodic table‚ are elements. All elements have a neutral charge‚ or the charge always equal 0. This is why the amount of protons and electrons are the same in every element. Also‚ the relative atomic mass does not include the electrons‚ because their mass is so small‚ it barely makes up the atom. Atomic Number & R.A.M To find the numbers of protons‚ neutrons and electrons of an element‚ we use the atomic number and the relative
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which of the following changes: a. Wavelength. b. Frequency. (Each question carrys 2 marks) 11. An element E has following electronic configuration:K L M 2 8 6 a. To which group of the periodic table does element E belong? b. To which period of the periodic table does element E belong? c. State the number of valence electrons present in element E. d. State the valency of the element E. 12. What is Pollination? Describe Cross Pollination. 13. The organisms formed by asexual reproduction
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water from other components in tap water 2.3 element simplest for mof matter that has a unique set of properties compound: subsgtance that contains two or more elements chemically combined in a fixed proportion chemical change: change that produces matter with a different composition than the original matter chemical symbol: each element represented by a one or two letter “symbol” periodic table: arrangement of elements where the elements are separated into groups based on a set of repeating
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Dr. John Andraos‚ http://www.careerchem.com/NAMED/Elements-Discoverers.pdf 1 NAMES OF SCIENTISTS ASSOCIATED WITH DISCOVERIES OF ELEMENTS OF PERIODIC TABLE © Dr. John Andraos 2002 - 2005 Department of Chemistry‚ York University 4700 Keele Street‚ Toronto‚ ONTARIO M3J 1P3‚ CANADA For suggestions‚ corrections‚ additional information‚ and comments please send e-mails to jandraos@yorku.ca http://www.chem.yorku.ca/NAMED/ Z‚ Element Symbol Discoverer Dates Nationality Place
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and Its Parent Elements Hypothesis The hypothesis of this experiment is magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties of each element (magnesium‚ oxygen‚ and magnesium oxide) might be different‚ from the state‚ color‚ electrical conductivity‚ and pH. Aim This experiment was performed to synthesize magnesium oxide by direct combination of magnesium and oxygen and to compare the properties of the elements (magnesium and
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Atoms of a given element which have the same number of protons but different numbers of neutrons are called isotopes. Thus‚ isotopes have the same position in the periodic table‚ the same chemical properties and the same atomic charge. The simplest example of an atom with different isotopes is hydrogen. The three isotopes of hydrogen are shown here: The increasing number of neutrons in the nucleus of the hydrogen atom adds mass to the atom and thus each isotope of a given element has a different
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But do you recall munching some molybdenum or snacking on selenium? Some 60 chemical elements are found in the body‚ but what all of them are doing there is still unknown. Roughly 96 percent of the mass of the human body is made up of just four elements: oxygen‚ carbon‚ hydrogen and nitrogen‚ with a lot of that in the form of water. The remaining 4 percent is a sparse sampling of the periodic table of elements. Some of the more prominent representatives are called macro nutrients‚ whereas those
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MATTER AND CHANGE Name _____________________________________ PRACTICE PROBLEMS Period _________________ Date ______________ SECTION 2.1 MATTER 1. Which of the following is not a physical change? a. dissolving sugar in water b. burning gasoline in an engine c. evaporating sea water to obtain salt d. slicing a piece of bread 2. Which of the following is not a property of a gas? a. has a definite shape b. has no definite volume c. assumes the shape of
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would look for how this cell or organism would execute homeostasis‚ as well as look for DNA. These are all properties that all living things share. 2. What happens if an atom of an element gains or loses electrons? What happens if an atom of an element gains or loses neutrons? What happens if an atom of an element gains or loses protons? Atoms in which the number of
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protons and electrons than tin? 6. Is mercury a heavier element than tin? 7. Does potassium have more electrons than neon? 8. Does hydrogen have more electrons than Uranium? 9. Which has more protons‚ sulfur or iodine? 10. Which has more protons‚ iodine or silver? 11. In the boxes below make Bohr models for each of the elements. a. Determine how many electrons‚ protons‚ and neutrons there are in each atom. b. Draw a Bohr model of each element using the number of electrons‚ protons‚ and neutrons c
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