Atomic Structure and Atomic Notations. Decide whether each of the following statements concerning atoms is true or false. All of the particles in the nucleus of an atom are charged. The atom is best described as a uniform sphere of matter in which electrons are embedded.
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Atom – smallest unit of an element that retains the properties of that element.
Very small compared to the total size of the atom. (marble = size of nucleus / football field = size of atom)
Composed of two particles
i. Proton= Positive particle
ii. Neutron = Neutral particle
Almost all mass is located in nucleus (extremely dense)
Nucleus held together by strong nuclear forces.
3) Atoms have very small masses. size of nucleus / football field = size of atom)
4) Atoms are electrically neutral. size of nucleus / football field = size of atom)
Atomic Number (Z) –
Mass Number (A) –
There are two different ways to represent atoms. size of nucleus / football field = size of atom)
Symbol Notation –
Determine the number of protons, neutrons, and electrons for a bromine-80 atom.
What is still unclear about today’s lesson?