Notesale: Turn your study into money

Document Preview

Extracts from the notes are below, to see the PDF you'll receive please use the links above

---

Atoms and Reactions

The Atom

Atoms are made up of Protons, Neutrons and Electrons
Atoms are the stuff all elements and compounds are made of
...

The mass and charge of these subatomic particles are tiny, so relative mass and relative charge
are used instead
...

Mass (Nucleon) Number
...


Element Symbol

Atomic (Proton) Number
1) This is the number of protons in the nucleus – it identifies the element
2) All atoms of the same element have the same number of protons
...

2) The number of neutrons is just mass number minus atomic number
...


Isotopes are Atoms of the Sane Element with Different Numbers of Neutrons
Isotopes of an element are atoms with the same number of protons but different numbers of
neutrons
1) It’s the number and arrangement of electrons that decides the chemical properties of
an element
...

2) Isotopes of an element do have slightly different physical properties though, such as
different densities, rates of diffusion, etc
...

a) Identify one similarity and one difference between these isotopes
[2 Marks]
b) Deuterium can be written as 2H
...

[1 Mark]
c) Write a nuclear symbol for tritium, given that it has 2 neutrons
...
3216S2-, B
...
3016S, D
...

a) Identify the similarity for each of the following pairs
...
A and B
[1 Mark]
ii
...
B and D
[1 Mark]
b) Which two of the atoms or ions are isotopes of each other? Explain your
reasoning

---