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Chemistry Review

Review for 9wk CA

QuestionAnswer
The nucleus of an atom is: positively charged and has a high density.
Gold Foil Lab discovered the nucleus. What new model of the atom resulted? A model in which the region outside the nucleus is largely empty space in which the electrons are situated.
How many protons, electrons, and neutrons does an atom with an atomic number 35 and a mass number 75 contain? 35 protons, 35 electrons, and 40 neutrons.
All atoms of the same element have the same: number of protons
The number of neutrons in the nucleus of an atom can be calculated by: Subtracting the number of protons from the mass number.
Which scientist developed the Plum Pudding Model of the atom? JJ Thomsom
EMISSION of light from an atom occurs when the electron: Drops from a higher to a lower energy level.
Who discovered that all matter contained electrons, e-? JJ Thomson
Express the product of 2.0 mm and 5.25 mm using the correct number of significant digits. 11 mm2
What is an example of an intensive property of matter? malleability
AM Radio Station broadcast at a frequency of 1.0 x 10^6 hertz. What is this station’s wavelength? 3.0 x 10^2 m
The common isotope of an element goes on the (top/bottom) of the isotope symbol. top
The atomic number of an element goes on the (top/bottom) of the isotope symbol. bottom
The atomic number is equal to... protons (also electrons)
The mass number is equal to... neutrons + protons
The number of neutrons is equal to... mass number - protons (electrons)
Created by: punisher42
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