Question | Answer |
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) |