They carry a charge, and are not trapped in a nucleus; they are responsible for the chemical prperties of the atom.
Carry a positive charge, equal and opposite to that of the electron. They are sequestered in the nubleus and cannot participate in chemical reactions.
They have no charge, but like protons, have mass.
________ ___________ is the basis for nuclear weapons, nuclear reactors, and nuclear medicine.
Prostate beams are used to treat
prostate, brian and lung cancers.
Which particle is often represented as a "planet" orgiting the "sun" (atomic mucleus)
Which particles form the nucleus?
Mass of neutron
1,009 Daltons( atomic mass unit)
Mass of proton
1,007 Daltons (atomic mass unit)
A neutral atom of a particular element has an equal number of ________ and ________
electrons and protons (so the +and -charge cancel out)
The number of _________ can vary.
Neutrons. The variation changes the atom's mass but not its chemical properties. Atoms which vary in the number of neutrons are called isotopes.
Atomic number is what
number of protons
Mass number is what
Sum of protons and neutrons
Graphic objective 8. Describe the charge, mass, and relative location of electrons, protons, and neutrons.
number of neutrons that vary
an isotope of hydrogen; Deuterium plus oxygen makes up so -called havy water (D2O), a compound used as a tracer in metabolic studies.
3H - Tritium
an isotope of hydrogen. tritium is unstable and a tritium atom will fall apart, on average, after 12 yrs. We call this half -life.
Some combinations of protons and neutrons that are unstable.
bond formed between two or more atoms that share electrons
because atoms "want" to gain or shed electrons to fill outer shells, valence also describes hou many
positions one moves on the periodic table to rach a noble gas column
Double covalent bond
when two electrons are shared equally
Triple covalent bond is when
three electons are shared from each atom
Polar covalent bond
This kind of bond means that the atoms have a patial charge on them, so it has poles and its called polar. Because this kind of bond has characteristics of a polor bond and a covalent bond... polor covalent bond
when atoms hang out together because they have opposite charges.
What atoms are in the human body that form polar covalent bonds
Ionic bonds are formed between
metal and non-metal ions
In a polar covalent bond that pull on eledtrons is measured in a quality called
are specialcharacteristics of compounds hat contain haydrogen and oxygen, hydrogen and ditrogen, and hydrogen and sulfer
More positve charges at one end, more negative charges at the other
a substance that dissolves in water to form one or more H+ ions and one or more anions
is a substance that dissolves in water to form one or more OH- ions and one or more cations
acids on the human body include
urine (most of the time)
bases in the human body include
urin (only rarely)
the most important buffer system in human biology is the
carbonic acid-bicarbonate buffer system
acts as a H+ and /or OH- "sponge" so that pH is kept relatively contant
negative logarithm of the hydrogen ion concentration