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Flashcards in Chapter 1 Deck (16):
1

Atoms

-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

2

Atom structure

Protons and neutrons exist in the centre of the atom (the nucleus).
Electrons are spread out around layers called shells and orbit the nucleus.

3

Elements

Mass number is the number of protons and neutrons.
Atomic number is the number of protons

4

Find the number of neutrons in a element

Atomic number - mass number = Neutron

5

Electron arrangement

Number of electrons a shell holds

6

Periodic Table

-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.

7

Group number

NUMBER OF ELECTRONS IN OUTER SHELL

8

Period number

NUMBER OF SHELLS OF ELECTRONS

9

Ions - Transferring Electrons.

GAIN ELECTRONS = NEGATIVE
LOSE ELECTRONS = POSITIVE

10

Isotopes

Different atomic forms of the same element, which have the SAME number of PROTONS
but a DIFFERENT number of NEUTRONS.

11

If you change the number of protons, neutrons and electrons

-PROTONS -
A different element
-NEUTRONS -
Same element
Different isotope
-ELECTRONS -
Same element
Different isotope

12

Pure...

Only one type of substance

13

Mixture...

Two or more substances not bonded together

14

Compound...

Two or more elements chemically combined

15

Element...

Only one type of atom

16

Reactions

Reactant → Products
MASS IS CONSERVED
(mass of reactants = mass of products)