Question

write the element name or symbol.

Explanation:

Step1: Determine electron - count from orbital diagram

The 1s orbital has 2 electrons, the 2s orbital has 2 electrons, the 2p orbital has 6 electrons, the 3s orbital has 2 electrons and the 3p orbital has 3 electrons. So the total number of electrons is \(2 + 2+6 + 2+3=15\).

Step2: Identify the element based on electron - count

The atomic number of an element is equal to the number of electrons in a neutral atom. The element with an atomic number of 15 is phosphorus, symbol P.

Answer:

Phosphorus (P)