Topic 1 - Key Concepts Flashcards
How did Mendeleev order the elements?
In order of atomic mas
Where did Mendeleev put elements with similar properties?
In the same row
Where are atoms with similar properties on the periodic table
The same group
How do you find the number of neutrons in an atom
Atomic mass - number of protons
Total relative charge of an atom
0
Total relative charge of the nucleus of an atom
+1
3 key scientists linked with atomic structure
John Dalton, JJ Thompson, Ernest Rutherford
Where is most of the mass concentrated in an atom
The nucleus
Compare the size of the nucleus to the overall size of the atom?
It is very small compared to the overall size of the atom
What did Mendeleev do with undiscovered elements in his periodic table?
He left gaps for where they would be for when they were discovered in the future
The modern periodic table is ordered in…
Atomic number
What is the relative charge of a proton?
+1
What is the relative mass of a proton?
1
What is the relative mass of a neutron?
1
What is the relative charge of a neutron?
0
Rows on the periodic table are known as…
Periods
What is the relative mass of an electron?
1/1835
What is atomic mass?
The total relative mass of the nucleus of an atom
What is the relative charge of an electron?
-1
What is the maximum number of electrons in an atoms third shell?
8
What is the maximum number of electrons in an atoms first shell?
2
What does the group number tell you about the electronic configuration of an atom?
The amount of electrons in its outer shell
How are electrons arranged?
In shells that surrounded and orbit the nucleus
What does the periodic number tell you about an atoms electronic configuration?
How many shells of electrons that element has
What is cracking?
Breaking down larger alkanes into smaller, more useful alkanes and alkenes
What is the equation for moles?
Moles = mass / molar mass
What is the atomic number?
The number of protons
What is an isotope?
An element with the same number of protons but different number of neutrons
