Revision Workbook Flashcards
Definition & example of an atom
Basic units of matter that cannot be broken down
&
Defining structure of elements
Example - carbon
Definition of element
A substance consisting of Atoms which all contain the same number of protons or the same atomic number - cannot be split up into simpler substances
Example of element
Magnesium
What is an ion
An electrically charged atom, (or group of atoms)
Formed by the loss or gain of 1 or more electrons
Example of ion
Sodium - Na+
Definition and example of matter
Everything around us that
Has mass
Occupies space
An apple!
definition of molecule
two or more atoms joined together chemically
not all molecules are compounds
definition of compound
a molecule containing at least two different elements
all compounds are molecules
ex molecule
oxygen 02
ex compound
H2O
definition of hydrophilic molecule
‘water loving’ polar molecules
ability to interact with (dissolve in) water
definition of hydrophobic molecule
‘water hating’ non-polar molecule
inability to interact with (dissolve in) water
example of hydrophilic molecule
salt
ex of hydrophobic molecule
fatty acids
which 4 elements are the major constituents of the human body
carbon
hydrogen
oxygen
nitrogen - CHON
subatomic particles in an atom are
protons
neutrons
electrons
what forms the nucleus of an atom
protons and neutrons
what part of an atom do protons and neutrons form
nucleus
periodic table is a list of all the known
elements
the periodic table is a list of the known elements arranged into periods that show us which elements have similar XXXX and XXXX properties
similar reactivity and physical properties
what charge do neutrons have
no charge
what charge do protons have
positive
what charge do electrons have
negative
where are electrons situated
buzzing around outside of nucleus
electrons move in groups around the nucleus called
electron shells
a stable element will have an equal number of
electrons and protons
what type of overall charge will a stable element have
a neutral charge
the letter in the centre of an element in the periodic table is the
symbol
the number in the top left hand corner of an element is the
atomic number
underneath the symbol of the element in periodic table is the
name
the big number at the bottom of an element in the periodic table is the
atomic weight/mass
symbol for hydrogen
H
symbol for sulfur
S
symbol for iron
Fe
Carbon symbol
C
potassium symbol
K
Nitrogen symbol
N
sodium symbol
Na
oxygen symbol
O2
magnesium symbol
Mg
