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