science chapter 23
quarks
protons & neutrons smaller particles 6 types names: up, down, charm, strange, top, & bottom protons: 2 up- 1 down neutrons: 2 down- 1 up
isotopes
atoms of the same element that have different numbers of neutrons
Rutherford
gold foil-alpha particles most mass of atoms in nucleus
neutron
is a neutral particle that exists in the nucleus of an atom
electron
is a particle with one negative charge
nuclear decay
is a process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
electron cloud
is an area around an atomic nucleus where and electron is most likely to be located
proton
is an atomic particle that has one positive charge
atom
is the smallest piece of an element that still represents that element
nucleus
most of an atom's mass and positive charge is concentrated in a small area in the center of the atom
block chart
5- # of protons B- element symbol Boron- element name 10.81-actomic mass
formula
LxWxH= volume of rectangle
mass number
an atom is the sum of the number of protons and neutrons in an atom
ion
an atom that is no longer neutral beccause it has gained or lost electrons
matter
anything that takes up space and has mass
the smallest piece of the element gold is a gold...
atom
atom
basic building block of matter
radioactive
elements that spontaneously emit radiation
what is an atom most likely made of?
empty space
mass
the amount of matter an object contains
volume
the amount of space an object occupies
define electron cloud in your own word.
the electron cloud is the area around the atomic nucleus where the electron is very likely to be
write a sentence that describes the nucleus of an atom.
the nucleus of an atom has all of the positive charge and neutrons concentrated in it.
atomic number
the number of protons in an atom of an element