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Science-Atom Questions and Answers
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Exam of 2 pages for the course Atom at Atom (Science-Atom)
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Science-AtomAtoms - answer1.)Smallest possible unit into which matter can be divided, while still
maintaining its properties.
2.)Made up of:
protons
neutrons
Electrons
3.)The solar system is commonly used as an analogy to describe the structure of an
atom.
Protons (+) - answer1.)Positively charged particles
2.)Part of the nucleus of the atom
3.)Identify the atom
4.)IS the atomic number of the atom
5.)Contribute to the atomic mass
Neutrons - answer1.)Neutral particles; have no electric charge
2.)Part of the nucleus of the atom
3.)Contribute to the atomic mass
Electrons (-) - answer1.)Negatively charged particles
2.)Found outside the nucleus of the atom, in the electron cloud/orbitals.
3.)Move so rapidly around the nucleus that they create an electron cloud
4.)Mass is insignificant when compared to protons and neutrons
5.)Amount of electrons is always equal to the number of protons
6.)Involved in the formation of chemical bonds
The NUCLEUS - answerProtons and neutrons are grouped together to form the "center"
or nucleus of an atom.
Atomic Number - answerThe number of protons in the nucleus of an atom
ATOMIC MASS - answer1.)The total number of protons and neutrons in an atom's
nucleus
2.)Measured in Atomic Mass Units (amu)
-Each proton or neutron has a mass of 1 amu
3.)The weighted average of the masses of all the naturally occurring isotopes of an
element
4.)The average considers the percent abundance of each isotope in nature
5.)Found on the periodic table of elements
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