Question

How many valence electrons would an element with an electron configuration ending in p5 have?

Answer 1

An element with an electron configuration ending in p5 has seven valence electrons, as it belongs to Group 17 of the periodic table, known as halogens.

Step-by-step explanation:

An element with an electron configuration ending in p5 would have seven valence electrons. This is because the p block elements in the periodic table have valence electrons given by the group number minus ten. Specifically, the p5 notation indicates the element is in Group 17 of the periodic table, which includes elements known as halogens. These elements are known for their high reactivity due to having seven valence electrons and being one electron short of a complete octet. For example, the element chlorine (Cl) has an electron configuration ending in 3p5, which tells us it has seven valence electrons.

Answer 2

Answer: 7 valence electrons

Step-by-step explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies.

Valence electrons are the number of electrons constituting the outermost shell of an atom.

Thus the electronic configuration could be :

`1s^22s^22p^5`

Thus the outermost orbit is 2 which has (2+5)= 7 electrons. Thus there are 7 valence electrons.