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10 Cards in this Set

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  • Back
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What is an atom?
An atom is the smallest particle of an element that contains the element's chemical identity.

It has a nucleus, which consists of protons, neutrons, and electrons.
Explain the behavior of alpha, beta, and gamma rays in an electric field.
Alpha rays are positively charged particles attracted to negatively charged plate.

Beta rays are negatively charged particles attracted to positively charged plates.

Gamma rays carry no charge and are unaffected by the electric field.
What is the atomic number?
Atomic number is the number of electrons or protons in an atom.
What is the mass number?
The mass number is the number of protons plus the number of neutrons in an atom.
What is an isotope?
Isotopes are atoms that have identical atomic numbers, but different mass numbers.
Different number of neutrons
What is the difference between molecular and empirical formulas?
Molecular formulas give the actual number and types of atoms in a molecule.

Empirical formulas only give relative number of atoms of each type in a molecule.
What is a molecule?
Two or more atoms bound together.
Define ion and describe the two types of ions.
Ions are formed when electrons are added to or removed from a neutral atom.

Cations are positively charged ions, and anions are negatively charged.
1-
1+
Explain what happens in ionic compounds.
Generally combined from metals and nonmetals.

One atom typically loses an electron and the other atom gains an electron. The ionic compound contains positively and negatively charged ions.
NaCl (table salt)
In ionic compounds, what do the metals form and what do the non-metals form?
Metals form positive ions, and nonmetals form negative ions.