Atoms
Most of the mass of an atom is here.
What is the nucleus?
Has atomic number 2.
What is helium?
table constructed as a way to group the elements
periodic table
are held together by an attraction between negatively and positively charged ions
ionic bonds
always contain carbon and hydrogen
organic molecules
Positively charged particle in an atom.
What is a proton?
Has atomic number 1
hydrogen
the periodic table is arranged in order of increasing
atomic number
NaCl
ionic bond
simple sugars and complex sugars
carbohydrates
Protons and Neutrons.
What are particles found in the nucleus of an atom?
The only nonmetal on the left side of the periodic table.
What is hydrogen?
vertical columns on period table
What are groups?
results when 2 atoms share electrons
covalent bond
fats and oils
lipids
Negatively charged particles found in atoms.
What are electrons?
a substance that can not be broken down into simpler substances with different properties by ordinary chemical means
element
the horizontal rows are called
periods
when the sharing of electrons between 2 atoms is fairly equal
non-polar covalent bond
polymers composed up of amino acid monomers
proteins
An atom that has either lost or gained an electron.
What is an ion?
Elements with varying numbers of neutrons.
What are isotopes?
the elements in group VIII are called
noble gases
the unequal sharing of electrons in a covalent bond
polar covalent bond
DNA & RNA
nucleic acids