Chapter 2 Review Flashcards
If you examined the body what four elements would be most common?
Oxygen
Nitrogen
Hydrogen
Carbon
A substance with specific properties that cannot be broken down or converted into another substance
Element
The atomic number of an atom is defined as the
The number of protons
Phosphorus has an atomic number of 15 so what is its distribution of its electrons?
The electron arrangement cannot be determined from the atomic number alone
Which four elements make up about 96% of living matter?
Carbon
Hydrogen
Nitrogen
Oxygen
What can radioactive isotopes be used for?
Detect brain rumors
For an atom to achieve maximum stability and become chemically inert, what must occur?
It’s outermost shell must be filled with electrons
An atoms nucleus is composed of what?
Protons and neutrons
What does the formation of ions involve?
gain or loss of electrons
The formation of Sodium Chloride is the result of what?
Attraction between opposite charges
What are atoms or molecules that have gained or lost electrons called?
Ions
What bond are most biological molecules joined by?
Covalent bonds
What does H-O-H represent?
A molecule of water
When does polar covalent bonds form?
When electrons are shared unequally between atoms
What part of the atom has the greatest biological influence?
The electrons
