holt science introduction to matter chapter 4
Terms in this set (22)
the smallest particle into which an element can be divided and still be the same substance
explanation for a broad range of hypothesis and observations that been suppoerted by testing
negative charged particles found in all atoms
representation of an oblect or system
extemely dense, postivley charged region
regions inside the atom where electrons are likely to be found
postively charged particles of the nucleus
atomic mass unit
SI unit to expressthe masses of particles atoms
particles of the nucleus and have no charge
number of protons in an nucleus of an atom
atoms that have the same number of protons but different neutron numbers
sum of the protons and neutrons in an atom
atomic mass unit, about the mass of a proton/neutron
Extra - 1.7 x 10^-24
Which have more mass, neutrons or protons?
If an atom has 5 protons, how many electrons does it have?
The mass of how many electrons equals the mass of a proton?
How many protons, neutrons, electrons does a hydrogen atom have?
1 proton, 0 neutrons, 1 electron
Do atoms always have an equal amount of protons and neutrons?
a particle that is electrically charged (positive or negative)
How can you determine which element an atom represents?
# of protons
An atom whose nucleus can change its composition - Isotope is radioactive
What are the four forces at work in an atom?
Gravity, Electromagnetic Force, Strong Force, Weak Force