Flashcards

Untitled

Melody Zeng English 7 cards

Cards in this deck (7)

1What is atomic numberthe # of protons
or
the # of electrons
2What is the mass numberThe total # of protons and neutrons
3What is atomic massThe weighted average of the mass and relative abundance
4How do you calculate number of neutronsmass # - atomic #
or
mass # - # of protons
5What makes an element that specific elementThe number of protons
6Explain John Dalton's atomic theory1. All elements are composed of tiny indivisible particles called atoms./
2. Atoms of the same element are identical. The atoms of any one element are different from those of any other element.
3. Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds.
4. Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction
7—