Atomic Structure Etc Flashcards
What number is the top number on an element ?
The mass number Ar
Protons + neutrons
What is the bottom number on the element?
The atomic number
The protons only
How do you work out the neutrons in an element ?
Mass number - atomic number
How do you calculate relative atomic mass ?
Total mass of the atoms( percentage x mass number) divided by The number of atoms
Concentration ?
Number of moles of solute divided by Volume of solvent
Relative formula mass ?
Mg = 24 and Cl = 35.5
24 + (2 x 35.5) = 95
So the relative formula mass of MgCl is 95
Number of moles ?
Number of moles = mass dived by atomic mass
Protons are the same as____? (Number wise)
Electrons
Group 0/ noble gases are_____
Unreactive
Metals on the____ and non metals on the_____
Left and right
Group number = ________
Electrons in outer shell
Period number = _________
Number of shells of electrons