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chemistry 1 exam

QuestionAnswer
What is the atomic radius? One half the distance between the nuclei of 2 atoms of the same element
What are the trends from top to bottom of atomic radius? and Why? Increases, each period on the table adds a new energy level to the electron cloud
what are the trends from left to right of atomic radiusand why? decreases, electrons added to to the same energy level experience increased attraction to the nucleus due to successive addition of protons.
What is ionization energy? Energy to remove an electron from an atom.
Whats first ionization? energy to remove the first elctron from an atom.
Whats second ionization? energy to remove the 2nd electron after the first is removed.
Why are electrons harder to remove across from ionization energy? Because the electrons are closer to the nucleus
Why are electrons easier to remove going down the colums for ionization energy? Because the atoms are larger the electrons are farther away from the nucleus
What is electronegativity? the ability to attract electrons when the atom is a compound
The electronegativity going across increases from left to right because The shared electrons are closer to the nuckeus in small amounts
Going up the the electronegativity increases because The shared electrons aere farther from the nucleus in larger atoms
What are teh properties of metals? solid shinymalleablegood conductors of Heat and electricityAnd ductility
Non-metal properties are dull\brittlepoor conductors can be solid liquid or gasare not conductive, malleable or ductivemostly fases or soft brittle solidsnegative ionsopposite of metals
What are metalloid properties A.k.a semi-metalsBoth metal and non-metal and non metal characteristics
When, how, and who published the classiffication system In 1829 Dobreiner published the classification system by grouping elements into traits and similar chemical properties
What were Dmitri Mendeleev's acomplishments? He was a russian chemist who published the the first table in 1869 and organized by by increasing atomic mass
What is the periodic law? When elements are arranged by increasing atomic numbers, their physical and chemical properties show a pattern
What Are Alkile metals? They are group one combined with non-metals, they all react with moister in the air, they have a silvery apperence and are soft enought to cut with a butter knifelow melting points and are not found as free elements.
What are the Alkili earth metals? The elements of goup 2 harder denser and stronger than alkili metals, they are less reactive than group one but are still too reactive to be found as free elements
What are transition metals? They are the d-block elements they are good conductors of electricity they are harder and denser than group 1 and 2 and they are non-reactive and are often found in nature as a free element
What are Halogens? The elements of group 17 and most reactive non-metal, they react with metals to form salts
What are noble gases? the elements of group 18 abd least reactive of all the elements and they have a complete outer shell
What did Democratis do?` He was the first to beleive in atoms and named them atoms
What duid John dalton do Formulated a precise def of atoms
What did J.J thompson do? he used the Cathode ray tube to find electronshe also used the plum pudding model
What did Ernest Rutheford do? Atoms had a positive proton s=charge
What is Chadwick's discovery? The ratio of was 4:1
What are isotopes? Atoms of a given element do not have the same mass
Wha is the difference between Isotopes and Ions? Ions either gain or lose electrons while the neutrons and protons stay the same the. Isotopes have the same protons and electrons but different neutrons.
What did Erin Shrodinger do? He formulated an equation for which the intensities of electron waves.
What is a physicalproperty and what doesnt change? The property that describes apperence, and the substancwe doesnt change
What is chemical property? what changes? Characterize the ability of a substance to react with other substances or transform one substance to another. The way the atoms are chemically bonded changes
What is a homogeneous mixture? A small AND EVENLY DISTRIBUTED mixture like sugar water
What are teh two types of a homogeneous mixture? A solution which involves a solvent and a solute like tea, and sodaAlso an alloy a solution of metals like brass
What is a heterogeneous mixture? When different particles of different sizes and are un evenly distributed
What are the two types of heterogeneous mixture? A suspension, Particles for layers and are seperated like italian dressing, also a colloid, in different places the layers are not visible like smoke and dairy, products
What is the difference between an ionic and covalent bond? An ionic bond is a bond between a metal and a non-metal by giving and taking electrons, a covalent bond is when 2 non-metals form by sharing electrons
Created by: studier9