Question

the Electric configuration of an atom is 2,8,7: what is the atomic number of this element ?​

Answer 1

Answer:

the electron configuration of an element shows how many electrons are present. Add them to get the atomic number. 2+8+7 = 17. Alternatively, there are 3 shells of electrons so the element is in period 3, and the last shell has 7 electrons

Answer 2

Explanation:

• So, the number of electrons present in an atom = 2+8+7 = 17.

• Therefore the atomic number of the element is equal to 17.

• The element having atomic number 17 is Chlorine