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2 years ago

An atom has the following electron configuration 1s2s2sp63s23p64s2 How many valance electrons does this atom have?

Chemistry

1 answer:

JulijaS [17]2 years ago

6 0

Answer:

The electron configuration for this atom is Calcium, which has 2 valence electrons.

Explanation:

Following the periodic table and with the electron configuration, you will end up with calcium, which has 2 valence electrons. (Always follow the electron configuration from left to right! It begins at hydrogen, then to helium... and so on.)

1s2 -> He....

2s2 -> Be....

2p6 -> Ne...

3s2 -> Mg...

3p6 -> Ar...

4s2 -> Ca.

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$\\ \sf\longmapsto 14u+3(1u)$

$\\ \sf\longmapsto 14u+3u$

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Now

$\boxed{\sf No\:of\:Molecules =No\:of\;moles\times Avagadro\:no}$

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$\\ \sf\longmapsto 3\times 6.023\times 10^{23}$

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Explanation:

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