hydrogen atom are A. evenly spaced. B. farther apart near the nucleus. C. closer together near the nucleus. D. arranged randomly. (Total 1 mark) 3. Which is related to the number of electrons in the outer main energy level of the elements from the alkali metals to the halogens? I. Group number II. Period number A. I only B. II only C. Both I and II D. Neither I nor II (Total 1 mark) 4. How do bond length and bond strength change as the number of bonds between two atoms increases
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1. a) The trend I notice from hydrogen to the highest numbered atom is that the atomic size increases as you go left from the element, and it decreases once you go up a group. b) Across a period, the size of an atom decreases (left to right). The increased positive charge in the nucleus has a greater attractive force for the outer valence electrons in the same energy level c) Up a group, the size of an atom decreases. The attractive force between the positive charge in the nucleus and the valence
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1. An oxygen atom has eight protons. (a) Sketch in the arrangement of electrons around the nucleus of the oxygen atom in the following diagram. (b) How many more electrons will it take to fill the outermost energy level? 2. What is the following type of decomposition reaction called? A–B–C–D + H2O → A–B–C–H + HO–D 3. The subatomic particle with the least mass (a) carries a negative charge, (b) carries a positive charge, (c) plays no part in the atom’s chemical reactions, (d) is found only
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A) ecosystem, population, organ system, cell, community, molecule, organ, organism, tissue B) cell, molecule, organ system, organ, population, tissue, organism, ecosystem, community C) organism, organ system, tissue, population, organ, community, cell, ecosystem, molecule D) molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem E) ecosystem, molecule, cell, tissue, organism, organ system, organ, community Answer:
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|1s22s22p63s23p63d104s1 |Copper (11) | 2. What is a molecule? Give 3 examples for diatomic molecules and draw their Lewis dot structures. In your structures, show the lone pair of electrons (unshared) and shared pair of electrons. A molecule is a neutral group of atoms joined together by covalent bonds. 3) Cobalt, a
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Human Biology Week 1: Worksheet 1. Consider the organization of life. Identify the different levels of organization from the cell to the organism. -The cell is the smallest unit displaying the properties of life that is the basic structural and functional unit of organisms. -Tissues are a group of similar cells that performs similar functions. - Organ is a structure that contains at least two different types of tissues that work together for a common purpose. -Organ system is a group of
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the total mass of an atom or “the average of the mass numbers of a representative sample of atoms of an element” under normal conditions (Life). Valence is the capacity of an atom to bond. This is normally the number of unpaired electrons in the outermost electron shell. They want a buddy to pair with so that they may happily balance
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at classifying elements into groups was done by Johann Döbereiner. In the early 19th century, Johann Döbereiner observed a little pattern in atomic weights and element’s properties and would put elements in groups of three elements, naming them triads. The three examples Döbereiner used was groups of “chlorine, bromine, and iodine, “calcium, strontium, and barium,” and “sulphur, selenium, and tellurium.” The middle element would have a halfway atomic number of the two other elements. Unfortunately
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that contains the same number of atoms as 12.0g of carbon -> 6.022 x 10^23 (Avogadro’s number) * Avogadro’s number – 6.022 x 10^23 * How to determine how many atoms of each element is in a compound: * (moles or grams)(6.022x10^23)(Number of atoms/1molecule) * Molar mass - Molar mass is the weight of one mole (or 6.022 x 1023 molecules) of any chemical compounds. * Mass % of an element in a compound: * ((Number of atoms of element)(atomic weight))/(Formula weight)
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IncorrectQuestion 1 0 / 1 pts Which of these is an example of homeostasis? Hummingbirds prefer to feed on nectar from red flowers. Homeostasis is the maintenance of the body's internal state within a relatively narrow range. When the dog's body temperature becomes too high, the animal feels hot. He opens his mouth, lets his tongue loll out, and pants until he feels comfortable again. A shark can detect even minute quantities of blood in the water. Venomous coral snakes and harmless
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