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QR Challenge: Chapter 4 Studyguide

Question	Answer
This determines what type of element an atom is	proton
In a neutral atom, these are the same	protons and electrons
In a neutral atom, the ___ can change, but the element will remain the same	neutrons
Protons + neutrons =	mass number
The average mass of atoms of an element , calculated using the relative abundance of isotopes in a naturally-occurring element	atomic mass
Give the isotope notation for Oxygen-16	16 8O
What has 35 protons, 35 electrons, and 45 neutrons?	Bromine-80
What has 92 protons, 92 electrons, and 143 neutrons?	Uranium-235
Give the isotope notation for Copper-64	64 29Cu
What has 29 protons, 29 electrons, and 35 neutrons?	Copper-64
What is in the nucleus of the atom?	protons and neutrons
Where are electrons found?	On the outside of the atom, floating around the nucleus
Who proposed the Plum Pudding Model?	Thomson
Who performed the gold foil experiment?	Rutherford
Who used their experiment to propose that atoms have a nucleus?	Rutherford
Who used their experiment to propose that atoms are positively charged with negative charges scattered throughout?	Thomson
Who proposed that everything was made of atoms?	Dalton
What is the isotope notation of the element that has an atomic number of 24 and a mass number of 52?	52 24Cr
What part of the atom contains practically all of its mass?	the nucleus
Which element contains the largest number of neutrons per atom? A) Bismuth-210 B) Polonium-210 C) Astatine-210 D) Astatine-211	A) Bismuth-210