Physical Science Midterm Review

Smallest building block of matter (makes up everything in the universe)

+ Located in the nucleus 1 amu

0 (no charge) Located in the nucleus 1 amu

- Located in the electron cloud 1/1836 amu

Smaller particles that make up an atom (protons, neutrons, electrons)

Element name & symbol, atomic # (# of protons), average atomic mass

Made up of only one type of atom

Same # of protons and electrons

Atom that has a charge (protons and electrons)

Negative ion, more electrons than protons, gained electrons

Positive ion, more protons than electrons, lost electrons

Same kind of atoms with different number of neutrons

Average mass of all known isotopes of a given element (most common isotope is closest to the AAM)

The mass of a specific type isotope and atom

Mass # -protons

protons - charge

protons + neutrons

protons - electrons

count of that type/total count * 100

(mass of that type * count of that type) /total count

(isotope mass * percent abundance) /100

-Fixed distance from the nucleus of an atom -Nucleus distance increases, energy level increases

2

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