4f and 5f block elements 1. Name the 4f – block elements and give their electronic configuration. Why are Sc‚ Y‚ and La included in the list of lanthanide elements 2. What is lanthanide contraction? How does it affect the chemical behavior of Zr/Hf‚ Hb/Ta‚ Mo/W ? 3. Contrast the electronic spectra of the lanthanide and transition metal ions. Why do the lanthanide ions give rise to very sharp bands in their electronic spectra and why are the magnetic properties of their complexes little affected by
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One thing that Robert Gray has mastered is leaving no detail big or small out. Flames and Dangling Wires is a poem that effectively conveys the effects of the human’s materialistic demands on the world. Robert Gray shows what life will inevitably be if our actions and attitudes do not change through the somewhat disturbing images that he renders The idea of a fog like shield is used to show that the increase production of waste is hiding us from the true reality of our actions. The smoke is seen
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(group 2) are less reactive than alkali metals because alkaline earth metals have 2 electrons in the s sublevel. Because the main energy level is filled‚ they are less likely to lose or gain an electron. 4. Alkaline earth metals are elements of group 2 in the periodic table‚ so they have 2 electrons in outermost energy level. So to become stable they will try to lose 2 electrons to have a stable electron configuration. So they all have +2 oxidation states. 5. The metallic character of alkaline earth
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The man of property Synopsis This episode covers the building of the house to the first moment of Forsyte family crisis. As it opens‚ Soames and Bosinney ride in a horse cart out to Robin Hill‚ where Soames is thinking of building a house. Soames is looking at cheaper sites lower on the hill‚ but Bosinney finds the perfect spot: at the top. The view is lovely‚ and even Soames is moved by it. He takes the site. Irene and June tell Bosinney‚ who’s working on a design‚ about how much they dislike
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------------------------------------------------- UNIT QUESTIONS FROM THIS ACADEMIC YEAR: ------------------------------------------------- Short Stories: How are different cultures‚ attitudes and characters are expressed within the limits of a short story? ------------------------------------------------- Othello: How might interpersonal relationships be detrimental to one’s status? ------------------------------------------------- Nineteen Eighty-Four: How does an individual respond to
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Atoms‚ Molecules and Elements Melissa DuBois Chem 110 September 16‚ 2013 Earl Steven Gurley Atoms‚ Molecules and Elements Atoms are the smallest unit of matter and a group of atoms can form chemical bonds in order to form a molecule. Molecules are groups of two or more atoms that have bound together and are the makings of matter. Elements are a substance that has only one type of atom that make up that element. First we can learn about how halogens and alkali metals are extremely reactive‚ where
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occurring antimicrobials for food preservation receives increasing attention due to consumer awareness of natural food products and a growing concern of microbial resistance towards conventional preservatives (Schuenzel et al.‚ 2002). Antimicrobial properties of herbs and spices have been recognized and used since ancient times for food preservation and in medicine. Herbs and
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University CJ230-02 Professor Hulvat September 7‚ 2010 Unit 9 Project There are many different crimes that people can commit in today’s society. For each crime there is an actus reus‚ mens rea‚ and it is classified as either crime against property‚ crime against person‚ or crime against public order. Listed below are kidnapping‚ robbery‚ and disorderly conduct. Kidnapping Kidnapping is a crime of unlawfully seizing and carrying away a person by force or seizing and detaining a person
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Rights above and below land The concept of “land” only extends upwards to a height necessary for the ordinary use and enjoyment of the surface (Bernstein v Skyviews & General Ltd [1978])Trespass above land at lower levels: “not whether the incursion actually interferes with the occupier’s actual use of the land at the time‚ but rather whether it is of a nature and at a height which may interfere with any ordinary uses of the land which the occupier may see fit to undertake” (LJP Investments v Howard
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PROPERTIES OF PREDICATE Properties of predicate devide into these type: Properties of Predicates Semmetry Reflexsive‚ Transitive Assymetry irreflexsive intransitive Symmetric predicate P = a two – place predicate X = referring expression Y = referring expression XPY entails YPX P = a symmetric predicate Assymmetric predicate P = a two – place predicate X = referring expression Y = referring expression XPY contradicted to YPX P = an assymmetric predicate
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