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Download Name: What are atoms? Atoms are the ______ building blocks of
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Name: _________________ What are atoms? Atoms are the _________ building blocks of ________ that make up everyday objects. A desk, the ______, even _______ are made up of atoms! There are ______ naturally occurring kinds of atoms. Scientists in labs have been able to make about ______ more. Atoms are made out of __________ basic particles: Protons – carry a ___________ charge Neutrons – carry ____________ charge Protons and Neutrons join ___________ to form the ______________ The __________ part of the atom Electrons – carry a ___________ charge and circle the nucleus The ________ _________ is the number of ________ in an atom of an element. Krypton’s atomic number is ________. This tells us that an atom of krypton has _____ ____________ in its ____________. The interesting thing here is that _________ atom of krypton contains _______ protons. If an atom doesn't have 36 protons, it can't be an atom of ____________. Adding or removing protons from the nucleus of an atom creates a different ____________. For example, removing one proton from an atom of krypton creates an atom of _____________. The Number of Neutrons is... The __________ __________ is the ________ number of ___________ in an atom's _______. In reality, it isn't that clean cut. The atomic weight is actually a weighted average of all of the naturally occurring isotopes of an element relative to the mass of carbon-12. Didn't understand that? Doesn't matter. All you really need to find is something called the _______ ___________. Unfortunately, the mass number isn't listed on the Table of Elements. Happily, to find the mass number, all you need to do is ________ the atomic ________ to the nearest ________ __________. In our example, krypton's mass number is _____ since its atomic weight, 83.80, rounds _______ to _________. The mass number is a count of the number of particles in an atom's nucleus. Remember that the nucleus is made up of protons and neutrons. So, if we want, we can write: Mass ________ = Number of ___________ + Number of _____________ For krypton, this equation becomes: 84 = __________ + _____________ Adding or removing __________ from an atom does ________ create a different element. Rather, it creates a _________ or __________ version of that element. These different versions are called ____________. Let’s practice: ______ = ______ + _______ _____ ______= _____ + 31 20 _______ Mass P N Mass P N Number NumberNumber Ga Ca Gallium Calcium 69.723 40.078 http://education.jlab.org/elementmath/index.html
