Homework 1-structure of an atom cue cards Flashcards
what is an element?
an element is pure chemicals that are made up of particles called atoms-every element is made up of only one atom
what does a carbon atom contain?***
only contains carbon atoms
properties of carbon atom ****
black colour,carries electricity, reacts with many other chemicals
what is a compound? **
contains 2 or more different atoms combined chemically
what is a molecule? **
A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds;
What is a mixture? **
contains 2 or more different substances that are not chemically combined. Can be physically separated
atom definition
(what does atom actually mean )
basic particles that makeup all our materials in the universe
more info on atom **
each particle is made up of only one type of atomeg element of gold is only made up of gold-one drop of water is more than a thousand billion atoms
atomic number
number of protons an atom has in its nucleus
mass number
number of protons and neutrons in the nucleus
electrons
An electron is a negatively charged subatomic particle that can be either bound to an atom or free
proton
an atomic particle that occurs in the nucleus of every atom and carries a positive charge equal in size to the negative charge of an electron.
neutron
neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen
IMPORTANT I DO NOT KNOW THIS!!!!!!!!!!!!!!!!!!!
atomic number =number of protons
mass number-protons +neutrons
number of protons=number of electrons
periodic number **
corresponding to the number of occupied electron shells
