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Radioactivity - Atomic Structure
An atom which has lost an electron is called an ion.

Radioactivity - Atomic Structure

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The scientific method involves developing a hypothesis and then carrying out experiments to gather evidence to support it, however, that hasn't always been the case. The ancient Greeks, for example, did not carry out anything other than thought experiments, in other words, they imagined what would happen if they had been able to do an experiment. One of these was the beginning of the theory of atomic structure.

1.
What is the relative mass of an electron?
+1
-1
0
+10
OK, that's not strictly true but you would need nearly 2,000 electrons to equal the mass of one proton or one neutron. The element with the highest number of electrons is element 118. Its atoms contain only 118 electrons which contribute so little to the mass of an atom, their mass can be ignored
2.
If an atom has 3 electrons, how many protons does it contain?
1
2
3
4
Remember, in an atom, the number of electrons is equal to the number of protons
3.
What is an atom called which has lost an electron?
Ion
Baryon
Quark
Oxygen
Ions can be formed when atoms gain electrons as well
4.
What is the relative charge of a neutron?
+1
-1
0
-10
Neutrons are neutral particles
5.
Atoms of an element always have the same number of protons but can have a different number of what?
Atomic numbers
Electron masses
Proton masses
Neutrons
An element is recognized for having a specific number of protons, the number of neutrons is variable. Elements which contain different numbers of neutrons are called isotopes
6.
A neutral atom has five protons. How many electrons does it contain if it is not an ion?
4
5
10
1
An atom will always have the same number of electrons as it does protons
7.
What is the relative mass of a proton?
+1
-1
0
+10
Whilst the mass of a proton is not actually +1, it is helpful for calculating relative masses when dealing with atomic physics
8.
What is an atom?
An atom is made up of an electron
An atom is a particle consisting of a small central nucleus containing protons and neutrons surrounded by electrons
An atom is made up of molecules such as H2O
An atom is a particle consisting of a small central nucleus containing neutrons and electrons surrounded by protons
The numbers of the protons and electrons are exactly equal in an atom
9.
What is the relative charge of a proton?
+1
-1
0
+10
One way of remembering this is to think about the first letter of proton - p for positive
10.
What does an atom's atomic number represent?
The number of particles within an atom in its nucleus
The number of protons in an atom in its nucleus
The number of neutrons in an atom in its nucleus
The number of electrons in an atom in its nucleus
Make sure that you know how to work out the number of particles in an atom from its atomic number and mass number, it is an easy way to gain marks
Author:  Martin Moore

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