How many protons and neutrons are there in the following nuclei ?
`._(6)C^(12)`,`._(8)O^(17)`,`._(12)Mg^(25)`,`. _(26)Fe^(56)`,`._(38)Sr^(88)`

Explanation

`._(6)^(13)C`
Atomic number `=6`
Number of electrons = Number of protons=6
Mass number =Number of neutrons + Number of protons
`13` =Number of neutrons `+6`
`:.` Number of neutrons `=13-6=7`
b. `._(8)^(16)O`
Atomic number=`8`
Number of electrons = Number of protons=`8`
Mass number = Number of neutrons + Number of protons
`16=` Number of neutons `+8`
Number of neutrons `=16-8=8`
c. `._(12)^(24)MG`
Atomic number `(Z)=12`
Z= number of electrons =number of protons `=12`
Mass number `=n+p`
`24=n+12`
or `n=24-12=12`
d. `._(26)^(56)Fe`
Atomic number `(Z)=26`
Z= Number of electrons = number of protons `=26`
Mass number`=n+p`
`56=n+26`
or `n=56-26=30`
e. `._(38)^(88)Sr`
Atomic number `(Z)=38`
Z= Number of electrons =Number of protons `=38`
Mass number `=n+p`
`88=n+38`
or `n=88-38=50`