Atomic Structure Flashcards
Where is the nucleus:
The centre of the atom
What is the nucleus made of:
Protons and neutrons
What orbits the nucleus:
Electrons
What is an isotope:
An atom of the same element with a different number of neutrons
What charge do electrons have:
Negative
What charge do protons have:
Positive
What charge do neutrons have:
Neutral/no
What is the mass of a proton:
1
What is the mass of a neutron:
1
What is the mass of an electron:
0/<1
How many electrons are in the first shell:
2
How many electrons are in the second shell:
8
How many electrons are in the third shell:
8
How many electrons are in the fourth shell:
18
Define atom:
The smallest part of an element that behaves like the element
The number of protons equals:
The number of electrons
What is an ion:
An atom that has lost or gained an electron
If an ion has lost electrons it has a:
Positive charge
If an ion has gained electrons it has a:
A negative charge
