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Reika [66]
3 years ago
10

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

Chemistry
1 answer:
JulijaS [17]3 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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