shirlval123 shirlval123

25-07-2021
Chemistry

contestada

An atom's first 2 energy levels are filled and there are 2 electrons in the third energy
level. It's atomic number is:

Respuesta :

nehemash nehemash

25-07-2021

Answer:

12

Explanation:

2+8+2=12

atomic no is the No of protons

Answer Link

trent008 trent008

25-07-2021

Answer:

Atomic number is 12.

Explanation:

Atomic number = electrons in filled shells + outermost electrons

= 2 + 8 +2

= 12

Answer Link

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