Atomci Structure Flashcards
Isotope definition
Isotopes are atoms of an element with The same number of protons and electrons, but different numbers of neutrons
Ion definition
Ions Are atoms that have lost or gained electrons
Atomic number
Atomic mass is the number of protons/neutrons in an atom
Atomic mass
Total number of protons plus total number of neutrons
You can find number of neutrons by
Subtracting atomic number from mass number
Bond length
The distance from the centre of one atom to the centre of another atom
Subatomic particles
Protons - positive
Electrons - negative
Electrons - neutral
Proton characteristics
They have a positive charge of +1, and have a mass of 1
Neutrons characteristic
Have a neutral charge and a mass of 1
Electrons characteristics
Have a charge of -1, and a mass of 0.005
6 MARKER
27|Al|13
What do the numbers 13 and 27 mean
Explain what the number tell you about the structure of an aluminium atom
- marks achieved : 6/6
Aluminium atoms contain 13 protons, 14 neutrons and 13 electrons. we can see this by looking at the atomic mass which is 27 and the atomic number which is 13. We know that the atomic number represents the total amount of protons/electrons in an atom. We also know that the number of protons and electrons are equal. Therefore there are 13 protons and 13 electrons in an aluminium atom. To find the total number of neutrons, we have to subtract the total atomic number (13) from the atomic mass (27), where we get 14. This means that there are 14 neutrons in an aluminium atom. Hence there are 13 protons and electrons and 14 neutrons in an aluminium atom.
Typical size of an atom
10^-10
What is the structure of an atom
Atoms consist of an extremely small, positively charged nucleus surrounded by electrons which orbit the nucleus in electron shells
