C3. Atomic structure & The Periodic Table Flashcards
What is the Atomic Number?
Number of Protons in an atom
What is the Atomic Mass? (or relative mass)
Number of Protons + number of Neutrons
found in the Nucleus
Define Atoms
Structure of an Element
Makes up everything
Atoms are made up of
Sub-atomic particles
Protons (+)
Neutrons (n)
Electrons (-)
What is the relative mass of a Proton?
1
What is the relative mass of a Neutron?
1
What is the relative mass of an Electron
1/2000
What is the relative charge of an Electron?
-1
Electrons have a charge of -1.6
What is the relative charge of an Proton?
1+
Charge of +1.6
What is the relative charge of a Neutron?
Neutrons carry no charge (0)
The Periodic table is ordered in an arrangement of ___ known elements?
118
Rows of the periodic table are called
Periods
columns of the Periodic table are called
Groups
All elements in a column (group) have the same number of…
Electrons
Who was the first Chemist to devise a Periodic table?
John Newlands
How table was ordered by weight of element
Who realised there may be undiscovered elements?
Dimitri Mendeleev
Added gaps to Newlands table for undiscovered elements
predicted properties and masses of undiscovered elements
Atoms are ______
Neutral
Define an Ion
Positively or negatively charged atom from chemical reaction (bonding)
Define a Molecule
Group of atoms joined together
Define Isotop
An Atom of the same element with a different number of Neutrons
A Nuclide is a type of ______
Isotop
Refers to a specific Nucleus that contains a certain number of Protons and Neutrons
Electrons have a fixed position in Atoms called ______ or ______ ______
Shells or Energy Levels
The closer the shell is to the nucleus, the _____ its energy level
lower
