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T or F? Philosophers formulated explanations about the nature of matter based on their own experiences
T or F? Dalton's atomic theory stated that atoms separate, combine, or rearrange in chemical reactions
T or F? Dalton's atomic theory stated that atoms of different elements combine in simple whole-number ratios to form coumpounds.
T or F? Democritus proposed that atoms are held together by chemical bonds, but no one believed him.
Plum pudding model
In this model, the atom is composed of electrons (which Thomson still called "corpuscles," though G.J. Stoney had proposed that atoms of electricity be called electrons in 1894), surrounded by a soup of positive charge to balance the electron's negative charge, like plums surrounded by pudding.
Nuclear atomic model
A theory of atomic structure in which nearly all the mass is concentrated in a small nucleus, electrons surrounding the nucleus fill nearly all the atom's volume, the number of these electrons equals the atomic number, and the positive charge on the nucleus is equal in magnitude to the negative charge of the electrons
104 protons, 104 electrons
Rutherfordium has an atomic # of 104. How many protons and electrons does it have?
84 protons, 84 electrons
Polonium has an atomic # of 84. How many protons and electrons does it have?
102 protons, 102 electrons
Nobelium has an atoic # of 102. How many protons and electrons does it have?
19 protons, 19 electrons, 20 neutrons
# of P, E, & N's- An isotope has atomic # 19 and mass number 39.
51 protons, 51 electrons, 72 neutrons
# of P, E, & N's- An isotope has an atomic # 51 and a mass # 123
smaller than the mass of a proton and a neutron, and a tiny fraction of the mass of an atom
The mass of an electron is....
both the relative abundance and the mass of each of the atom's isotopes
The atomic mass of an atom is usually not a whole # because it accounts for
Gold foil experiment 1909-mass concentrated in very small core at the atom's center (nucleus)
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