U1 T1 Atomic Structure Flashcards
Who designed the “Plum Pudding” model
J.J. Thompson (1897)
What did the Plum Pudding model look like
Negative electrons embedded in a positive sphere
What did Rutherford do?
He changed the Plum Pudding to have electrons orbiting a positive nucleus
What did Chadwick do?
He discovered the neutron
Can you fill in the blanks?
Atoms are composed of small, dense, (1) charged nuclei at the centre composed of (2) and (3) with (4) charged electrons in (5) orbiting the (6)
1 positively 2 protons 3 neutrons 4 negatively 5 shells 6 nucleus
What are the charges on a neutron, proton, and electron?
Proton = +1 Electron = -1 Neutron = 0
How much does a proton, neutron, and electron weigh?
Proton = 1 Neutron = 1 Electron = 1/1840
What is an atomic number
The protons in an atom
What is the mass number
The total amount of protons and neutrons
What is an ion
An electrically charged atom
What is a cation
Positively charged ion
What is an anion?
A negatively charged ion.
What is an isotope
Atoms of an element with the same atomic number but a different mass number indicating a different number of neutrons
How to you calculate relative atomic mass from the mass number and abundance of its isotopes?
(Percentage 1 x mass number) + (percentage 2 + mass number)——————————————————————
100
What is a compound?
Two or more different elements chemically combined
