C2 Chemistry - atoms and compounds Flashcards
1
Q
what is the mass no*
A
total number of protons and neutrons
2
Q
what is the stomic no*
A
no* of protons
3
Q
how do you find the no* of neutrons?
A
subtract atomic no* - from the masss no*
4
Q
how are compounds formed?
A
atoms or two or more elements are chemically combined together
5
Q
what are isotopes?
A
different atomic forms of the same elements
same n* of protons
different n* of neutrons
6
Q
how are ions formed?
A
when atoms lose or gain electrons
7
Q
what are ions?
A
electrically charged particles
8
Q
what does ‘ionise’ mean?
A
metal atoms and non-metal atoms go in an opposite direction
9
Q
what happens to metal atoms?
A
they lose electrons and become positively charged
10
Q
what happens to non metals?
A
they gain electrons from other atoms and become negatively charged
