Answer
a) no. of protons = 19.
No. of electrons = 18.
b) no. of protons = 16.
No. of electrons = 18
c) no. of protons = 25
No. of electrons = 23
d) no. of protons = 26
No. of electrons = 24
e) no. of protons = 55.
No. of electrons = 54
f) no. of protons = 53.
No. of electrons = 54
Work Step by Step
a) The element is potassium (K). Hence, no of protons = 19.
Now, for neutral atom no. of electrons = 19.
Here, there is +1 charge on the atom. Hence, no. of electrons = 19-1 = 18.
b) The element is sulfur (S). hence, no. of protons = 16.
Now, for neutral atom no. of electrons = 16.
here, there is -2 charge on the atom i.e. two extra electrons are present. Hence, no. of electrons = 16+2 = 18.
c) the element is Manganese (Mn). hence, no. of protons = 25.
for neutral atom no. of electrons = 25.
Here, there is +2 charge on the atom i.e. two electron is less than in the neutral atom. hence, no. of electrons = 23.
d) the element is iron (Fe). Hence, no. of protons = 26.
for neutral atom no. of electrons = 26.
Here, there is +2 charge on the atom i.e. two electron is less than in the neutral atom. hence, no. of electrons = 24.
e) the element is Cesium (Cs). Hence, no. of protons = 55.
for neutral atom no. of electrons = 55.
here, there is +1 charge on the atom i.e. one electron is less than in the neutral atom. hence, no. of electrons = 54.
f) the element gained 1 electron
