Structure Of The Atom Flashcards
What are the 3 sub-atomic particles of an atom?
Protons, neutrons and 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?
0
What is the relative charge of a proton?
+1
What is the relative charge of a neutron?
0
What is the relative charge of an electron?
-1
What is the mass number?
The top number
What is the atomic number?
The bottom number
How do yo find the mass number?
protons+neutrons
What does the atomic number tell us?
the number of protons
What is the relation between protons and electrons?
they are equal
How do you find the number of neutrons?
Mass number-atomic number
What are isotopes?
atoms of the same element with a different number of neutrons but the same number of protons and electrons
How many electrons can the first shell hold?
2
How many electrons can all the other shells hold?
8
What is the nucleus of an atom made up of?
protons and neutrons
What charge do atoms have?
no overall charge
What is the relation between the total number of electrons in an atom and the number of protons in a nucleus?
they are always the same
What does the number of electrons on the outer shell tell us about the element?
the group it is in
Why does an atom have no overall charge?
the equal numbers of protons and electrons cancel each other out
