Chemistry 5.1 Section Review Answers

Rutherford proposed the Nuclear Model (also called the Solar System model). He concluded that:

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The vertical columns. Elements in the same group share the same number of valence electrons and similar chemical properties. Chemistry 5.1 Section Review Answers

: Their discovery required adding a completely new group to the periodic table. 3. Glencoe Chemistry: Light and Quantized Energy

: Discovered that elements should be arranged by atomic number (nuclear charge) rather than mass, which corrected inconsistencies in Mendeleev's table. Rutherford proposed the Nuclear Model (also called the

: Niels Bohr proposed that electrons are found in specific circular paths, or , around the nucleus. Energy Levels : Each orbit has a fixed amount of energy.

: The modern description that determines the probability of finding an electron in a specific region of space, known as an atomic orbital . 2. HMH Modern Chemistry: History of the Periodic Table The vertical columns

This experiment shattered the idea that atoms were indivisible. Thomson measured the charge-to-mass ratio of the electron, earning him the title "discoverer of the electron."

: It could not explain the chemical properties of elements or why objects change color when heated.