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activity 3: electron Configurations

•write the electron configuration of the elements in the third period;

•determine the pattern of filling the orbitals based on the given distribution for the first 10 elements; and

•device rules in filling up the orbitals.​

Answer 1

Answer:

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Explanation:

1. Electronic configuration:

Third period elements are - Na, Mg, Al, Si, P, S, Cl, Ar

Na - 1s2, 2s2, 2p6, 3s1

Mg - 1s2, 2s2, 2p6, 3s2

Al - 1s2, 2s2, 2p6, 3s2, 3p1

Si - 1s2, 2s2, 2p6, 3s2, 3p2

P - 1s2, 2s2, 2p6, 3s2, 3p3

S - 1s2, 2s2, 2p6, 3s2, 3p4

Cl - 1s2, 2s2, 2p6, 3s2, 3p5

Ar - 1s2, 2s2, 2p6, 3s2, 3p6

2. First 10 elements are distributed in 1s, 2s and 2p

Example:

H - 1s1

He - 1s2

Li - 1s2, 2s1

Be - 1s2, 2s2

B - 1s2, 2s2, 2p1

C - 1s2, 2s2, 2p2

N - 1s2, 2s2, 2p3

O - 1s2, 2s2, 2p4

F - 1s2, 2s2, 2p5

Ne - 1s2, 2s2, 2p6

3. We fill up the orbitals of each element with the helps of Aufbau principle of electronic configuration. According to this principle, orbitals are filled in the order of increasing energy.

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