A neutral atom has the following electronic configuration:1s2 2s2 2p6 3s23p5How many protons...

A neutral atom has the following electronic configuration: 1s² 2s² 2p⁶ 3s²3p⁵

How many protons are in the atomic nucleus and to which group of the periodic table does this element belong?

Expert Solution

1s2 2s2 2p6 3s2 3p5

Just add the number of electrons in each sub shells, that is =2+2+6+2+5 = 17, means atomic number of given element is 17, or ₁₇Cl. Therefore the number of protons = 17

Reason: the number of protons and electrons are equal in a neutral atom.

Group?

It belongs to 17 th group or halogens family. Another way of finding group number of elements in p-block is, add 10 with the number of electrons in valance shell, 3s² 3p⁵ . So group number = 10+2+5 =17

₁₇Cl = 1s² 2s² 2p⁶ 3s² 3p⁵

queen_honey_blossom answered 2 years ago

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