Answer:
Ca-atomic no.20
mass no.40.078
protons no.20
electron no.(Ar)4s²
neutrons no.20
Se-34
78.96
34
(Ar)3d¹⁰4s²4p⁴
45
try ko lng not sure to other answers
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Answer:
Ca-atomic no.20
mass no.40.078
protons no.20
electron no.(Ar)4s²
neutrons no.20
Se-34
78.96
34
(Ar)3d¹⁰4s²4p⁴
45
try ko lng not sure to other answers