Question

14 identify the element based on the information below. located in period 2 and has three valence electrons.

Explanation:

Step1: Recall electron - shell structure rules

Elements in period 2 have electrons in the first and second electron - shells. The first shell has 2 electrons, and the number of valence electrons is the number of electrons in the outermost shell.

Step2: Determine the atomic number

The total number of electrons in an atom is equal to its atomic number. For an element in period 2 with 3 valence electrons, the first shell has 2 electrons and the second shell (valence shell) has 3 electrons. So the total number of electrons is 2 + 3=5.

Step3: Identify the element

The element with an atomic number of 5 is Boron (B).

Answer:

Boron (B)