structure of an atom- chemistry

empirical formula

able to be measured

formula unit

what the empirical formula is usually called

compound

materials with more than one type of element stuck together

atomic weight

how much the element weighs relative to other elements

atomic mass unit (AMU)

used to compare different elements

the mole

conversion factor between AMU and grams

Avogadro’s number

another name for the mole

what is the conversion factor?

6.022 × 10²³

molar mass

the mass of one mole of something

An element is defined by the number of _______ it has.

protons

The atomic number is equal to the number of ______ in an atom.

protons

isotopes

atoms of the same element that have different numbers of neutrons

protons

• + charge

• located in the nucleus

neutrons

• neutral charge

• located in the nucleus

electrons

• - charge

• located outside the nucleus

What is the role of a proton?

defines mass

What is the role of a neutron?

nucleus ‘glue’

What is the role of an electron?

defines chemistry