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36 Cards in this Set
- Front
- Back
the smallest particle of matter |
ATOM |
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has mass and takes up space |
MATTER |
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who was the first who proposed the idea of an atom who believed that all things are made up of tiny, invisible particles |
LEUCIPPUS |
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Student of leucippus |
DEMOCRITUS |
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Atom comes from the greek word of |
ATOMOS |
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What is the meaning of the greek word of atom? |
INVISIBLE |
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What do you call to the people who supported the idea of the atom? |
ATOMISTS/LEUCIPPUS GF STAN |
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Leucippus and Democritus theory that atoms were indivisible was strongly opposed by |
ARISTOTLE |
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what are the four elements that all matter consisted that Aristotle claimed |
EARTH, FIRE, WATER AND AIR |
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Who said that all elements of matter are composed of extremely small particles called atoms? |
JOHN DALTON |
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states that the different samples if the same compound always contains constituent elements in the same proportion by mass |
LAW OF DEFINITE PROPORTIONS |
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If two elements can combine to form more than one compound, one element that combine with a fixed mass of the other element is in ratios of the whole numbers |
LAW OF MULTIPLE PROPORTIONS |
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Involves only the seperation, combination, or rearrangement of atoms |
CHEMICAL REACTION |
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States that matter can be neither created nor destroyed |
LAW OF CONSERVATIVE OF MASS |
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the atom is made up of something like a positively charged pudding-like material in which negatively charged electrons were scattered like plums in the pudding |
THOMSON'S PLUM PUDDING MODEL OF THE ATOM |
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Atom is mostly an empty space that has a dense positively charged center that repelled the positively charged alpha particleswhich he used "bullets" in the experiment. This center of the atom was given the name "nucleus" by Rutherford. |
RUTHERFORD MODEL OF THE ATOM |
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in his model, he placed each electron on a specific energy level. This electron move in different orbits around the nucles. |
BOHR'S MODEL OF THE ATOM |
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The theory of wave mechanics explains that the movement of electrons about an atom has no definite path. |
WAVE MODEL OF THE ATOM |
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A- mass number (no. of protons and neutrons) Z- atomic number (no. of protons) X- element symbol e- atomic change |
ISOTOPE NOTATION |
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Found at the center of the atom |
NUCLEUS |
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Electrically neutral they have no charge |
NEUTRON |
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Positively charged sub particle found in the nucleus of the atom |
PROTON |
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Negative charged particle |
ELECTRON |
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number of proton is equal to the number of electrons |
ATOMIC NUMBER OF THE ATOM |
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Atomic mass is equal to the total number of protons and neutrons |
eurt |
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Formed by chemical bonds. Composed of two or more elements |
COMPOUND MOLECULES |
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when molecules tend to share electrons to complete the required electrons. (Occurs in between non metals) |
COVALENT BOND |
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Electrons are transferred (occurs in between a metal and non metal) |
IONIC BOND |
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The extend of sharing of electrons between atoms in a molecule is dependent of the electronegativity or the ability of each atom to attract electrons toward it |
tama |
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All atom has its own electronegativity value (Ev) |
sigi |
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Electronegativity unit |
∆EN |
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Based of Linus Pauling's scale, () is the most electronegative element |
FLOURINE |
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Least electronegativity element |
CESIUM & FRANCIUM |
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∆EN ≥ 2.0 (2.0- UP) |
IONIC BOND |
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0.5 < ∆EN < 2.0 (0.6-1.9) |
POLAR COVALENT BOND |
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0 ≥ ∆EN ≤ 0.5 (0-0.5) |
NONPOLAR COVALENT BOND |