Question

Fill in the gaps in the following table, assuming each column represents a neutral atom:

symbol	65/30Zn
Protons		38			92
Neutrons		58	49
Electrons			38	36
Mass no.				81	235

Answer 1

	65/30 Zn	96/38 sr	87/38 sr	81/36 kr	235/92U
protons	30	38	38	36	92
neutrons	35	58	49	45	143
electrons	30	38	38	36	92
Mass no	65	96	87	81	235

Sr=strontium

Kr=krypton

U=uranium

Mass no=# of protons+# of neutrons

Neutron=mass no- # of protons

Protons=electrons (electroneutrality principle of atoms as positive charge (protons) equals negative charge (electrons)

65/30 Zn

65=mass no

30=atomic no=# of protons (characteristic property of atom)