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Question: An atom has the electronic configuration of \(1s^{2},2s^{2}2p^{6}\), \(3s^{2}3p^{6}3d^{10},4s^{2}4p^...

An atom has the electronic configuration of 1s2,2s22p61s^{2},2s^{2}2p^{6}, 3s23p63d10,4s24p53s^{2}3p^{6}3d^{10},4s^{2}4p^{5}. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be

A

35 and 45

B

45 and 35

C

40 and 40

D

30 and 50

Answer

35 and 45

Explanation

Solution

35Br80=1s22s22p63s23p63d104s24p535Br^{80} = 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{5}

A=80A = 80, Z=35Z = 35, N=?N = ?

N=A−Z=80−35=45\mathbf{N = A}\mathbf{-}\mathbf{Z = 80}\mathbf{-}\mathbf{35 = 45}

Atomic number (Proton) is 35 and no. of neutron is 45.