Atomic Structure Flashcards
What is an atom made up of?
Protons
Neutrons
Electrons
What is at the centre of every atom?
Nucleus
What are protons and neutrons also known as?
Nucleons
What orbits the nucleus at relatively large distances?
Electrons
What us the relative charge of a proton?
+1
What is the relative mass of a proton?
1
What is the relative charge of a neutron?
0
What is the relative mass of a neutron?
1
What is the relative charge of an electron?
-1
What is the relative mass of an electron?
0.0005
What is the proton number?
Number of protons in the nucleus
What is the proton number also known as?
Atomic number
What defines the element?
Proton number
In a neutral atom, what does the number of electrons equal?
Number of protons
What is the nucleon number also called?
Mass number
What is the symbol of the proton number?
Z
What is the symbol for the nucleon number?
A
What is the nucleon number?
How many protons and neutrons are in the nucleus
What is the specific charge of a particle?
Ratio of its charge to mass
What is specific charge given in?
Coulombs per kilogram
What is the formula for specific charge?
Charge divided by mass
What are isotopes?
Atoms with the same number of protons but different numbers of neutrons
Does changing the number of neutrons affect the atom’s chemical properties?
No
What does the number of neutrons affect?
Stability of the nucleus
How may unstable nuclei make themselves more stable?
By being radioactive and decay themselves
