Biology 120 Notes (Part 2) Continuing the Discussion of Atoms and Other Molecules
Isotopes deal with neutrons in the atom.
They differ in the number of neutrons.
Some isotopes spontaneously decay and release radiation.
Electrons are attracted to the nucleus; it takes energy to hold electrons in place.
Electrons determine chemical behavior of atoms.
The outermost energy shell is called the valence shell.
The octet rule is a rule describing how a valence shell can only hold eight electrons (unless the atomic number is two or less.)
Molecules are atoms held together by chemical bonds.
Molecular bonds contain energy.
Valence shells determine the bonding activity.
There are three types of covalent bonds which are called: ionic, covalent, and hydrogen.
An ion is a charged atom.
An ionic bind forms when electrons are transferred from one atom to another.
Salts are sold substances that usually sperate and exist as individual ions in water.
The first ring holds only two electrons
After the second ring and as more rings are created, they will hold eight electrons each.
Covalent bonds are a type of bond that describes how electrons are shared.
Covalent bonds can either be polar or nonpolar.
Electrons are not always shared equally.
Atoms may have different electronegativities.
Electronegatives describe the strength with which atoms pull electrons toward themselves.
In general, when moving up to the right on the periodic table, the higher the electronegativity.
A hydrogen bond is a weak attraction between a slightly positive hydrogen atom and a slightly negative tom in another molecule.
Isotopes deal with neutrons in the atom.
They differ in the number of neutrons.
Some isotopes spontaneously decay and release radiation.
Electrons are attracted to the nucleus; it takes energy to hold electrons in place.
Electrons determine chemical behavior of atoms.
The outermost energy shell is called the valence shell.
The octet rule is a rule describing how a valence shell can only hold eight electrons (unless the atomic number is two or less.)
Molecules are atoms held together by chemical bonds.
Molecular bonds contain energy.
Valence shells determine the bonding activity.
There are three types of covalent bonds which are called: ionic, covalent, and hydrogen.
An ion is a charged atom.
An ionic bind forms when electrons are transferred from one atom to another.
Salts are sold substances that usually sperate and exist as individual ions in water.
The first ring holds only two electrons
After the second ring and as more rings are created, they will hold eight electrons each.
Covalent bonds are a type of bond that describes how electrons are shared.
Covalent bonds can either be polar or nonpolar.
Electrons are not always shared equally.
Atoms may have different electronegativities.
Electronegatives describe the strength with which atoms pull electrons toward themselves.
In general, when moving up to the right on the periodic table, the higher the electronegativity.
A hydrogen bond is a weak attraction between a slightly positive hydrogen atom and a slightly negative tom in another molecule.