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Review sheet for Building Blocks of Molecules2.1 Atoms, Isotopes, Ions, and Molecules1.Definition of matter:
2.Definition of elements.
3.How are elements designated?
4.What are the four elements common to all living organisms?
5.Definition of atom.
6.The atom is composed into what two regions and what are found in each of those regions?
7.How is hydrogen (H) unique in terms of its subatomic particles?
8.Electrons are found in ___________ surrounding the nucleus.
9.How do we designate the mass of a proton or a neutron?
10.How do protons and neutron differ from each other?
11.Based on the answer to #10, what contribution does a neutron make to an atom?12.What role do electrons have in contributing to an atom’s mass?
13.Do electrons carry a charge?If so, how can that charge be measured?
14.When observing an atom with equal numbers of protons and electrons, we would recognize that thisatom has a net charge of (+1, 0, or -1)?
15.What is found in 99% of an atom’s volume?
16.What prevents one atom from moving through another atom?
17.What determines an element’s specific atomic number and can be used to distinguish one element fromanother?
18.What is an isotope?
19.If the atomic mass of an element is its protons plus neutrons, why is the atomic mass of chlorine35.45?In other words, why is there a fraction (.45) in its mass number?

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