Chem Flashcards
Elements
substances that cant be decomposed further
Compounds
substances made up of two or more elements, chemically bonded
Mixtures
substances made up of two or more elements, NOT chemically bonded
Physical change
Appearance/form has changed
It is still same substance and can most likely be reverted back to original form
No new properties
Chemical change
The chemical formation has been altered
New properties
Can’t be reverted
Can become new substance
Metals (located left side periodic table)
high melting points
good conductors of electricity & heat
high density
malleable
solids at room temp (excluding mercury)
Nonmetals (located on the staircase, upper right)
low melting points
bad conductors of electricity & heat
dull and can’t be polished
neither tough nor strong
can be liquid solid or gas at room temp
What is located in the nucleus of the shell
protons and neutrons
Atomic number =
no. protons and electrons
number of neutrons?
atomic mass - atomic number
charge of an atom
neutral, when it has a charge it becomes an ion.
where are valence electrons located
outer most shell
ionic bonds connect
metals and nonmetals
process of ionic bonding
metal and nonmetal are separate
metal gives electron/s to nonmental to fill the valence shell
atoms get a charge and become ions
because opposites attract, the ions attract each other with electrostatic attraction, forming a bond
covalent bonds connect
similar nonmetal + nonmetal
