C2 Chemistry - atoms and compounds Flashcards Preview

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Flashcards in C2 Chemistry - atoms and compounds Deck (10)
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1

what is the mass no*

total number of protons and neutrons

2

what is the stomic no*

no* of protons

3

how do you find the no* of neutrons?

subtract atomic no* - from the masss no*

4

how are compounds formed?

atoms or two or more elements are chemically combined together

5

what are isotopes?

different atomic forms of the same elements
same n* of protons
different n* of neutrons

6

how are ions formed?

when atoms lose or gain electrons

7

what are ions?

electrically charged particles

8

what does 'ionise' mean?

metal atoms and non-metal atoms go in an opposite direction

9

what happens to metal atoms?

they lose electrons and become positively charged

10

what happens to non metals?

they gain electrons from other atoms and become negatively charged