Question..?

The element, scandium, proton (atomi) number, Z=21 was discovered by L Nilson in Sweden in1879.

(a)it forms only one ion which has the formula Sc^3+... which 45 is at the top(left) and down 21(left)

(i)how many electrons, protons and neutrons are there in this ion?

(i) Predict the electron distribution of this ion..

Answer:
a) 45 is the sum of protons and neutrons ; 21 is the number of protons
i) Sc atom has 21 electrons , 21 protons and 45-21 = 24 neutrons
Sc3+ has 18 electrons , 21 protons and 24 neutrons
i) The electron distribution of the ion is :
1s2, 2s2 , 2p6 , 3s2 , 3p6
The electron distribution of the atom is :
1s2, 2s2 , 2p6, 3s2 , 3p6 , 3d1 , 4s2

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