Periodic Table and chemical symbols

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Question description

Question 4

a)From the Periodic Table

•Give the chemical symbol for krypton

•What is its atomic number

•How many electrons and protons are there in an atom of krypton

b)Give the valencies (charge and number) of




c)How many:

•Electrons in a bromide ion (Br-) 

•Protons in a silver atom (Ag)

•Neutrons in the helium 4 isotope (4He

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