Flashcards in Chapter 1 Deck (16):
-All substances are made of atoms
-An element contains only one type of atom
-A compound contains more than one type of atom chemically bonded together
-Over 100 different elements in the Periodic Table
Protons and neutrons exist in the centre of the atom (the nucleus).
Electrons are spread out around layers called shells and orbit the nucleus.
Mass number is the number of protons and neutrons.
Atomic number is the number of protons
Find the number of neutrons in a element
Atomic number - mass number = Neutron
Number of electrons a shell holds
-COLUMNS are called GROUPS
-Elements in the same group have the same number of electrons in their outer shell
-Gives them similar chemical properties
-Group 0 – The Noble Gases – full outer shells so are nonreactive and do not form bonds.
NUMBER OF ELECTRONS IN OUTER SHELL
NUMBER OF SHELLS OF ELECTRONS
Ions - Transferring Electrons.
GAIN ELECTRONS = NEGATIVE
LOSE ELECTRONS = POSITIVE
Different atomic forms of the same element, which have the SAME number of PROTONS
but a DIFFERENT number of NEUTRONS.
If you change the number of protons, neutrons and electrons
A different element
Only one type of substance
Two or more substances not bonded together
Two or more elements chemically combined
Only one type of atom